Develop Reference

Get both networks when a phone has Dual Sim

I am trying to get a list of networks on Android devices that have multiple SIM cards "dual sim."
I use the TelephonyManager class but the method getNetworkType only returns the network for the first sim "sim 1."

There's no API for this before Android Android 5.1 (API22). But then you have SubscriptionManager and its getActiveSubscriptionInfoList()

I have found a posible solution. I have used the android reflection to call TelephonyManager methods for example if i want the data Network I can use getDataNetworkType as follows:
getNetworkTypeReflection(telephonyManager, "getDataNetworkType", slot, false);
private static String getNetworkTypeReflection(final TelephonyManager telephony, final String predictedMethodName, final int slotID, final boolean isPrivate) {
String result = null;
try {
final Class<?> telephonyClass = Class.forName(telephony.getClass().getName());
final Class<?>[] parameter = new Class[1];
parameter[0] = int.class;
final Method getSubtecnology;
if (slotID != -1) {
if (isPrivate) {
getSubtecnology = telephonyClass.getDeclaredMethod(predictedMethodName, parameter);
} else {
getSubtecnology = telephonyClass.getMethod(predictedMethodName, parameter);
}
} else {
if (isPrivate) {
getSubtecnology = telephonyClass.getDeclaredMethod(predictedMethodName);
} else {
getSubtecnology = telephonyClass.getMethod(predictedMethodName);
}
}
final Object obPhone;
final Object[] obParameter = new Object[1];
obParameter[0] = slotID;
if (getSubtecnology != null) {
if (slotID != -1) {
obPhone = getSubtecnology.invoke(telephony, obParameter);
} else {
obPhone = getSubtecnology.invoke(telephony);
}
if (obPhone != null) {
result = obPhone.toString();
}
}
} catch (Exception e) {
//e.printStackTrace();
return null;
}
return result;
}
The problem is that this option only works on Android 5.1 (API22) but only in some device in others you need Android 7.0 (API24).
If anyone has other options are welcome.

Android : Check whether the phone is dual SIM

After a lot of research on forums, now I know that there is no way to find IMSI or SIM serial number for both the SIM cards in a dual SIM phone (except for contacting the manufacturer). Now my changed question is, can we at all detect that the phone has two SIMs? I believe it can be detected with some intelligence. Few ways I can think of are:
Dialing an USSD code and tracing the logs for IMEI number (I tried this with *139# in India. It worked.) This will give me IMEI number for the SIM from which I dialed the USSD code. (It is presumed that the phone follows android guidelines and has two IMEI numbers.)
Storing the SIM serial number and/or IMSI for the SIM. And after detection of any other IMSI/Serial number even if the phone was not rebooted (i.e. the SIM was switched) by tracing some logs or by some broadcast event handling.
By dialing *06# you will get to see both IMEI numbers. By some way, get those two numbers. (Something like screen capturing and image parsing for text.)
If anyone can think of some other ways, they are most welcome. I would really appreciate any kind of help regarding this. Also, if anyone has any information about any manufacturers APIs or links to contact them, please do share with the community people.

Update 23 March'15 :
Official multiple SIM API is available now from Android 5.1 onwards
Other possible option :
You can use Java reflection to get both IMEI numbers.
Using these IMEI numbers you can check whether the phone is a DUAL SIM or not.
Try following activity :
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TelephonyInfo telephonyInfo = TelephonyInfo.getInstance(this);
String imeiSIM1 = telephonyInfo.getImsiSIM1();
String imeiSIM2 = telephonyInfo.getImsiSIM2();
boolean isSIM1Ready = telephonyInfo.isSIM1Ready();
boolean isSIM2Ready = telephonyInfo.isSIM2Ready();
boolean isDualSIM = telephonyInfo.isDualSIM();
TextView tv = (TextView) findViewById(R.id.tv);
tv.setText(" IME1 : " + imeiSIM1 + "\n" +
" IME2 : " + imeiSIM2 + "\n" +
" IS DUAL SIM : " + isDualSIM + "\n" +
" IS SIM1 READY : " + isSIM1Ready + "\n" +
" IS SIM2 READY : " + isSIM2Ready + "\n");
}
}
And here is TelephonyInfo.java :
import java.lang.reflect.Method;
import android.content.Context;
import android.telephony.TelephonyManager;
public final class TelephonyInfo {
private static TelephonyInfo telephonyInfo;
private String imeiSIM1;
private String imeiSIM2;
private boolean isSIM1Ready;
private boolean isSIM2Ready;
public String getImsiSIM1() {
return imeiSIM1;
}
/*public static void setImsiSIM1(String imeiSIM1) {
TelephonyInfo.imeiSIM1 = imeiSIM1;
}*/
public String getImsiSIM2() {
return imeiSIM2;
}
/*public static void setImsiSIM2(String imeiSIM2) {
TelephonyInfo.imeiSIM2 = imeiSIM2;
}*/
public boolean isSIM1Ready() {
return isSIM1Ready;
}
/*public static void setSIM1Ready(boolean isSIM1Ready) {
TelephonyInfo.isSIM1Ready = isSIM1Ready;
}*/
public boolean isSIM2Ready() {
return isSIM2Ready;
}
/*public static void setSIM2Ready(boolean isSIM2Ready) {
TelephonyInfo.isSIM2Ready = isSIM2Ready;
}*/
public boolean isDualSIM() {
return imeiSIM2 != null;
}
private TelephonyInfo() {
}
public static TelephonyInfo getInstance(Context context){
if(telephonyInfo == null) {
telephonyInfo = new TelephonyInfo();
TelephonyManager telephonyManager = ((TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE));
telephonyInfo.imeiSIM1 = telephonyManager.getDeviceId();;
telephonyInfo.imeiSIM2 = null;
try {
telephonyInfo.imeiSIM1 = getDeviceIdBySlot(context, "getDeviceIdGemini", 0);
telephonyInfo.imeiSIM2 = getDeviceIdBySlot(context, "getDeviceIdGemini", 1);
} catch (GeminiMethodNotFoundException e) {
e.printStackTrace();
try {
telephonyInfo.imeiSIM1 = getDeviceIdBySlot(context, "getDeviceId", 0);
telephonyInfo.imeiSIM2 = getDeviceIdBySlot(context, "getDeviceId", 1);
} catch (GeminiMethodNotFoundException e1) {
//Call here for next manufacturer's predicted method name if you wish
e1.printStackTrace();
}
}
telephonyInfo.isSIM1Ready = telephonyManager.getSimState() == TelephonyManager.SIM_STATE_READY;
telephonyInfo.isSIM2Ready = false;
try {
telephonyInfo.isSIM1Ready = getSIMStateBySlot(context, "getSimStateGemini", 0);
telephonyInfo.isSIM2Ready = getSIMStateBySlot(context, "getSimStateGemini", 1);
} catch (GeminiMethodNotFoundException e) {
e.printStackTrace();
try {
telephonyInfo.isSIM1Ready = getSIMStateBySlot(context, "getSimState", 0);
telephonyInfo.isSIM2Ready = getSIMStateBySlot(context, "getSimState", 1);
} catch (GeminiMethodNotFoundException e1) {
//Call here for next manufacturer's predicted method name if you wish
e1.printStackTrace();
}
}
}
return telephonyInfo;
}
private static String getDeviceIdBySlot(Context context, String predictedMethodName, int slotID) throws GeminiMethodNotFoundException {
String imei = null;
TelephonyManager telephony = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
try{
Class<?> telephonyClass = Class.forName(telephony.getClass().getName());
Class<?>[] parameter = new Class[1];
parameter[0] = int.class;
Method getSimID = telephonyClass.getMethod(predictedMethodName, parameter);
Object[] obParameter = new Object[1];
obParameter[0] = slotID;
Object ob_phone = getSimID.invoke(telephony, obParameter);
if(ob_phone != null){
imei = ob_phone.toString();
}
} catch (Exception e) {
e.printStackTrace();
throw new GeminiMethodNotFoundException(predictedMethodName);
}
return imei;
}
private static boolean getSIMStateBySlot(Context context, String predictedMethodName, int slotID) throws GeminiMethodNotFoundException {
boolean isReady = false;
TelephonyManager telephony = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
try{
Class<?> telephonyClass = Class.forName(telephony.getClass().getName());
Class<?>[] parameter = new Class[1];
parameter[0] = int.class;
Method getSimStateGemini = telephonyClass.getMethod(predictedMethodName, parameter);
Object[] obParameter = new Object[1];
obParameter[0] = slotID;
Object ob_phone = getSimStateGemini.invoke(telephony, obParameter);
if(ob_phone != null){
int simState = Integer.parseInt(ob_phone.toString());
if(simState == TelephonyManager.SIM_STATE_READY){
isReady = true;
}
}
} catch (Exception e) {
e.printStackTrace();
throw new GeminiMethodNotFoundException(predictedMethodName);
}
return isReady;
}
private static class GeminiMethodNotFoundException extends Exception {
private static final long serialVersionUID = -996812356902545308L;
public GeminiMethodNotFoundException(String info) {
super(info);
}
}
}
Edit :
Getting access of methods like "getDeviceIdGemini" for other SIM slot's detail has prediction that method exist.
If that method's name doesn't match with one given by device manufacturer than it will not work. You have to find corresponding method name for those devices.
Finding method names for other manufacturers can be done using Java reflection as follows :
public static void printTelephonyManagerMethodNamesForThisDevice(Context context) {
TelephonyManager telephony = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
Class<?> telephonyClass;
try {
telephonyClass = Class.forName(telephony.getClass().getName());
Method[] methods = telephonyClass.getMethods();
for (int idx = 0; idx < methods.length; idx++) {
System.out.println("\n" + methods[idx] + " declared by " + methods[idx].getDeclaringClass());
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
EDIT :
As Seetha pointed out in her comment :
telephonyInfo.imeiSIM1 = getDeviceIdBySlot(context, "getDeviceIdDs", 0);
telephonyInfo.imeiSIM2 = getDeviceIdBySlot(context, "getDeviceIdDs", 1);
It is working for her. She was successful in getting two IMEI numbers for both the SIM in Samsung Duos device.
Add <uses-permission android:name="android.permission.READ_PHONE_STATE" />
EDIT 2 :
The method used for retrieving data is for Lenovo A319 and other phones by that manufacture (Credit Maher Abuthraa):
telephonyInfo.imeiSIM1 = getDeviceIdBySlot(context, "getSimSerialNumberGemini", 0);
telephonyInfo.imeiSIM2 = getDeviceIdBySlot(context, "getSimSerialNumberGemini", 1);

I have a Samsung Duos device with Android 4.4.4 and the method suggested by Seetha in the accepted answer (i.e. call getDeviceIdDs) does not work for me, as the method does not exist. I was able to recover all the information I needed by calling method "getDefault(int slotID)", as shown below:
public static void samsungTwoSims(Context context) {
TelephonyManager telephony = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
try{
Class<?> telephonyClass = Class.forName(telephony.getClass().getName());
Class<?>[] parameter = new Class[1];
parameter[0] = int.class;
Method getFirstMethod = telephonyClass.getMethod("getDefault", parameter);
Log.d(TAG, getFirstMethod.toString());
Object[] obParameter = new Object[1];
obParameter[0] = 0;
TelephonyManager first = (TelephonyManager) getFirstMethod.invoke(null, obParameter);
Log.d(TAG, "Device Id: " + first.getDeviceId() + ", device status: " + first.getSimState() + ", operator: " + first.getNetworkOperator() + "/" + first.getNetworkOperatorName());
obParameter[0] = 1;
TelephonyManager second = (TelephonyManager) getFirstMethod.invoke(null, obParameter);
Log.d(TAG, "Device Id: " + second.getDeviceId() + ", device status: " + second.getSimState()+ ", operator: " + second.getNetworkOperator() + "/" + second.getNetworkOperatorName());
} catch (Exception e) {
e.printStackTrace();
}
}
Also, I rewrote the code that iteratively tests for methods to recover this information so that it uses an array of method names instead of a sequence of try/catch. For instance, to determine if we have two active SIMs we could do:
private static String[] simStatusMethodNames = {"getSimStateGemini", "getSimState"};
public static boolean hasTwoActiveSims(Context context) {
boolean first = false, second = false;
for (String methodName: simStatusMethodNames) {
// try with sim 0 first
try {
first = getSIMStateBySlot(context, methodName, 0);
// no exception thrown, means method exists
second = getSIMStateBySlot(context, methodName, 1);
return first && second;
} catch (GeminiMethodNotFoundException e) {
// method does not exist, nothing to do but test the next
}
}
return false;
}
This way, if a new method name is suggested for some device, you can simply add it to the array and it should work.

There are several native solutions I've found while searching the way to check network operator.
For API >=17:
TelephonyManager manager = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
// Get information about all radio modules on device board
// and check what you need by calling #getCellIdentity.
final List<CellInfo> allCellInfo = manager.getAllCellInfo();
for (CellInfo cellInfo : allCellInfo) {
if (cellInfo instanceof CellInfoGsm) {
CellIdentityGsm cellIdentity = ((CellInfoGsm) cellInfo).getCellIdentity();
//TODO Use cellIdentity to check MCC/MNC code, for instance.
} else if (cellInfo instanceof CellInfoWcdma) {
CellIdentityWcdma cellIdentity = ((CellInfoWcdma) cellInfo).getCellIdentity();
} else if (cellInfo instanceof CellInfoLte) {
CellIdentityLte cellIdentity = ((CellInfoLte) cellInfo).getCellIdentity();
} else if (cellInfo instanceof CellInfoCdma) {
CellIdentityCdma cellIdentity = ((CellInfoCdma) cellInfo).getCellIdentity();
}
}
In AndroidManifest add permission:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
</manifest>
To get network operator you can check mcc and mnc codes:
https://en.wikipedia.org/wiki/Mobile_country_code (general information).
https://clients.txtnation.com/hc/en-us/articles/218719768-MCCMNC-mobile-country-code-and-mobile-network-code-list- (quite full and quite latest list of operators).
For API >=22:
final SubscriptionManager subscriptionManager = SubscriptionManager.from(context);
final List<SubscriptionInfo> activeSubscriptionInfoList = subscriptionManager.getActiveSubscriptionInfoList();
for (SubscriptionInfo subscriptionInfo : activeSubscriptionInfoList) {
final CharSequence carrierName = subscriptionInfo.getCarrierName();
final CharSequence displayName = subscriptionInfo.getDisplayName();
final int mcc = subscriptionInfo.getMcc();
final int mnc = subscriptionInfo.getMnc();
final String subscriptionInfoNumber = subscriptionInfo.getNumber();
}
For API >=23. To just check if phone is dual/triple/many sim:
TelephonyManager manager = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
if (manager.getPhoneCount() == 2) {
// Dual sim
}

I am able to read both the IMEI's from OnePlus 2 Phone
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
TelephonyManager manager = (TelephonyManager) getActivity().getSystemService(Context.TELEPHONY_SERVICE);
Log.i(TAG, "Single or Dual Sim " + manager.getPhoneCount());
Log.i(TAG, "Default device ID " + manager.getDeviceId());
Log.i(TAG, "Single 1 " + manager.getDeviceId(0));
Log.i(TAG, "Single 2 " + manager.getDeviceId(1));
}

I was taking a look at the call logs and I noticed that apart from the usual fields in the contents of managedCursor, we have a column "simid" in Dual SIM phones (I checked on Xolo A500s Lite), so as to tag each call in the call log with a SIM. This value is either 1 or 2, most probably denoting SIM1/SIM2.
managedCursor = context.getContentResolver().query(contacts, null, null, null, null);
managedCursor.moveToNext();
for(int i=0;i<managedCursor.getColumnCount();i++)
{//for dual sim phones
if(managedCursor.getColumnName(i).toLowerCase().equals("simid"))
indexSIMID=i;
}
I did not find this column in a single SIM phone (I checked on Xperia L).
So although I don't think this is a foolproof way to check for dual SIM nature, I am posting it here because it could be useful to someone.

Tips:
You can try to use
ctx.getSystemService("phone_msim")
instead of
ctx.getSystemService(Context.TELEPHONY_SERVICE)
If you have already tried Vaibhav's answer and telephony.getClass().getMethod() fails, above is what works for my Qualcomm mobile.

I have found these system properties on Samsung S8
SystemProperties.getInt("ro.multisim.simslotcount", 1) > 1
Also, according to the source: https://android.googlesource.com/platform/frameworks/base/+/master/telephony/java/com/android/internal/telephony/TelephonyProperties.java
getprop persist.radio.multisim.config returns "dsds" or "dsda" on multi sim.
I have tested this on Samsung S8 and it works

for sdk api 26+ (Build.VERSION_CODES.O):
val telephony = context.getSystemService(Service.TELEPHONY_SERVICE) as? TelephonyManager
// check telephony on null
val simCount = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
telephony.activeModemCount
} else {
telephony.phoneCount
}

Commonsware says this is not possible. Please see the following:
Detecting Dual SIM using Android SDK is not possible.
Here is further dialog on the subject:
Google dev team guy says detecting Dual SIM using Android SDK is not possible.

Hide the passed call after telephonyService.endCall()?

In my app i'm using auto end of call for a list of numbers in a such way...
public class PhoneStateBroadcastReceiver extends BroadcastReceiver {
private static final String TAG = null;
String incommingNumber;
String inc= "+799999999";
public void onReceive(Context context, Intent intent) {
Bundle bundle = intent.getExtras();
if(null == bundle)
return;
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
try {
// Java reflection to gain access to TelephonyManager's
// ITelephony getter
TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
Log.v(TAG, "Get getTeleService...");
Class c = Class.forName(tm.getClass().getName());
Method m = c.getDeclaredMethod("getITelephony");
m.setAccessible(true);
com.android.internal.telephony.ITelephony telephonyService = (ITelephony) m.invoke(tm);
Bundle b = intent.getExtras();
incommingNumber = b.getString(TelephonyManager.EXTRA_INCOMING_NUMBER);
Log.v(TAG,incommingNumber );
Log.v(TAG,incno1 );
if ( incommingNumber.equals(inc) )
{
telephonyService = (ITelephony) m.invoke(tm);
telephonyService.silenceRinger();
telephonyService.endCall();
Log.v(TAG,"BYE BYE BYE" );
}
else{
telephonyService.answerRingingCall();
Log.v(TAG,"HELLO HELLO HELLO" );
}
} catch (Exception e) {
e.printStackTrace();
Log.e(TAG,
"FATAL ERROR: could not connect to telephony subsystem");
Log.e(TAG, "Exception object: " + e);
}
}
}
It works for me... But missed call is shown in the phone... Is it possible to hide it and not to display?

Yes, use the following line to Cancel the call notification.
telephonyService.cancelMissedCallsNotification();

Block incoming calls

my VoiP-client would like to block all incoming calls to the phone while my own call is taking place. Is it possible to do this somehow?

Yes you can block incoming calls. Using this code
String phonestate = bundle.getString(TelephonyManager.EXTRA_STATE);
try
{
if (TelephonyManager.EXTRA_STATE_RINGING.equalsIgnoreCase(phonestate))
{
try
{
TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
Class c = Class.forName(tm.getClass().getName());
Method m = c.getDeclaredMethod("getITelephony");
m.setAccessible(true);
telephonyService = (com.android.internal.telephony.ITelephony) m.invoke(tm);
}
catch (Exception e)
{
e.printStackTrace();
}
if (prefStatus != null)
{
if (count == 1)
{
telephonyService.endCall();
String prefLoginemail = myloginpref.getString("emailid", null);
System.out.println(printdata + " prefLoginemail :: "+ prefLoginemail);
Global.mNotificationManager = (NotificationManager) mxcontext.getSystemService(Context.NOTIFICATION_SERVICE);
notifyDetails = new Notification(com.CellPhoneTerror.R.drawable.icon1,"CellPhoneTerror!", System.currentTimeMillis());
myIntent = PendingIntent.getActivity(mxcontext, 0, new Intent(mxcontext, clsHomePage.class), 0);
notifyDetails.setLatestEventInfo(mxcontext,"You Got a Call from Blocked Number.", "",myIntent);
notifyDetails.flags |= Notification.FLAG_AUTO_CANCEL;
Global.mNotificationManager.notify(Global.SIMPLE_NOTFICATION_ID,notifyDetails);
}
}
}
if (prefIncomingBlock.equals("true"))
{
if (TelephonyManager.EXTRA_STATE_IDLE.equalsIgnoreCase(phonestate))
{
if (count == 0)
{
System.out.println("if Cellphoneterror:"+ Global.clsIncomingNum);
Intent block = new Intent(context, dialogbox1.class);
block.setFlags(intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(block);
}
}
}
}
catch (Exception e)
{
e.printStackTrace();
}
Thanks.

Not with the current SDK no, You can monitor incoming calls and give the user the option to answer with your application instead of the native app

How to hang up outgoing call in Android?

I am developing an application where one of the things we need is to control the outgoing call, at least to be able to stop it from our application.
I've tried using Intent.ACTION_CALL from an existing activity:
Intent callIntent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + phoneNumber));
startActivity(callIntent);
But stopping the call seems to be disallowed through the API.
Can you suggest some workaround?
For example: enabling airplane mode during the call? Just an example; this hack didn't work for me.

Capturing the outgoing call in a BroadcastReceiver has been mentioned and is definitely the best way to do it if you want to end the call before dialing.
Once dialing or in-call, however, that technique no longer works. The only way to hang up that I've encountered so far, is to do so through Java Reflection. As it is not part of the public API, you should be careful to use it, and not rely upon it. Any change to the internal composition of Android will effectively break your application.
Prasanta Paul's blog demonstrates how it can be accomplished, which I have summarized below.
Obtaining the ITelephony object:
TelephonyManager tm = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);
try {
// Java reflection to gain access to TelephonyManager's
// ITelephony getter
Log.v(TAG, "Get getTeleService...");
Class c = Class.forName(tm.getClass().getName());
Method m = c.getDeclaredMethod("getITelephony");
m.setAccessible(true);
com.android.internal.telephony.ITelephony telephonyService =
(ITelephony) m.invoke(tm);
} catch (Exception e) {
e.printStackTrace();
Log.e(TAG,
"FATAL ERROR: could not connect to telephony subsystem");
Log.e(TAG, "Exception object: " + e);
}
Ending the call:
telephonyService.endCall();

EDIT: To Android P or newer, please see: https://stackoverflow.com/a/51121175/450148
Try this:
(I used Reflection to access advanced telephony features and modify somethings)
// required permission <uses-permission android:name="android.permission.CALL_PHONE"/>
try {
//String serviceManagerName = "android.os.IServiceManager";
String serviceManagerName = "android.os.ServiceManager";
String serviceManagerNativeName = "android.os.ServiceManagerNative";
String telephonyName = "com.android.internal.telephony.ITelephony";
Class telephonyClass;
Class telephonyStubClass;
Class serviceManagerClass;
Class serviceManagerStubClass;
Class serviceManagerNativeClass;
Class serviceManagerNativeStubClass;
Method telephonyCall;
Method telephonyEndCall;
Method telephonyAnswerCall;
Method getDefault;
Method[] temps;
Constructor[] serviceManagerConstructor;
// Method getService;
Object telephonyObject;
Object serviceManagerObject;
telephonyClass = Class.forName(telephonyName);
telephonyStubClass = telephonyClass.getClasses()[0];
serviceManagerClass = Class.forName(serviceManagerName);
serviceManagerNativeClass = Class.forName(serviceManagerNativeName);
Method getService = // getDefaults[29];
serviceManagerClass.getMethod("getService", String.class);
Method tempInterfaceMethod = serviceManagerNativeClass.getMethod(
"asInterface", IBinder.class);
Binder tmpBinder = new Binder();
tmpBinder.attachInterface(null, "fake");
serviceManagerObject = tempInterfaceMethod.invoke(null, tmpBinder);
IBinder retbinder = (IBinder) getService.invoke(serviceManagerObject, "phone");
Method serviceMethod = telephonyStubClass.getMethod("asInterface", IBinder.class);
telephonyObject = serviceMethod.invoke(null, retbinder);
//telephonyCall = telephonyClass.getMethod("call", String.class);
telephonyEndCall = telephonyClass.getMethod("endCall");
//telephonyAnswerCall = telephonyClass.getMethod("answerRingingCall");
telephonyEndCall.invoke(telephonyObject);
} catch (Exception e) {
e.printStackTrace();
Log.error(DialerActivity.this,
"FATAL ERROR: could not connect to telephony subsystem");
Log.error(DialerActivity.this, "Exception object: " + e);
}

Create a BroadcastReceiver with a priority of 0.
In the BC intercept the ACTION_NEW_OUTGOING_CALL intent in its onReceive method
call setResultData(null) in the same method
This will prevent the call from initiating (as long as your receiver is the last to process the intent I think)

Here's the most updated code, which will work for Android P too, because it has an official API for it (here) :
in manifest, add this:
<uses-permission android:name="android.permission.ANSWER_PHONE_CALLS"/>
In code, use this:
Java:
#SuppressLint("PrivateApi")
public static boolean endCall(Context context) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
final TelecomManager telecomManager = (TelecomManager) context.getSystemService(Context.TELECOM_SERVICE);
if (telecomManager != null && ContextCompat.checkSelfPermission(context, Manifest.permission.ANSWER_PHONE_CALLS) == PackageManager.PERMISSION_GRANTED) {
telecomManager.endCall();
return true;
}
return false;
}
//use unofficial API for older Android versions, as written here: https://stackoverflow.com/a/8380418/878126
try {
final Class<?> telephonyClass = Class.forName("com.android.internal.telephony.ITelephony");
final Class<?> telephonyStubClass = telephonyClass.getClasses()[0];
final Class<?> serviceManagerClass = Class.forName("android.os.ServiceManager");
final Class<?> serviceManagerNativeClass = Class.forName("android.os.ServiceManagerNative");
final Method getService = serviceManagerClass.getMethod("getService", String.class);
final Method tempInterfaceMethod = serviceManagerNativeClass.getMethod("asInterface", IBinder.class);
final Binder tmpBinder = new Binder();
tmpBinder.attachInterface(null, "fake");
final Object serviceManagerObject = tempInterfaceMethod.invoke(null, tmpBinder);
final IBinder retbinder = (IBinder) getService.invoke(serviceManagerObject, "phone");
final Method serviceMethod = telephonyStubClass.getMethod("asInterface", IBinder.class);
final Object telephonyObject = serviceMethod.invoke(null, retbinder);
final Method telephonyEndCall = telephonyClass.getMethod("endCall");
telephonyEndCall.invoke(telephonyObject);
return true;
} catch (Exception e) {
e.printStackTrace();
LogManager.e(e);
}
return false;
}
or in Kotlin:
#SuppressLint("PrivateApi")
fun endCall(context: Context): Boolean {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
val telecomManager = context.getSystemService(Context.TELECOM_SERVICE) as TelecomManager
if (ContextCompat.checkSelfPermission(context, Manifest.permission.ANSWER_PHONE_CALLS) == PackageManager.PERMISSION_GRANTED) {
telecomManager.endCall()
return true
}
return false
}
//use unofficial API for older Android versions, as written here: https://stackoverflow.com/a/8380418/878126
try {
val telephonyClass = Class.forName("com.android.internal.telephony.ITelephony")
val telephonyStubClass = telephonyClass.classes[0]
val serviceManagerClass = Class.forName("android.os.ServiceManager")
val serviceManagerNativeClass = Class.forName("android.os.ServiceManagerNative")
val getService = serviceManagerClass.getMethod("getService", String::class.java)
val tempInterfaceMethod = serviceManagerNativeClass.getMethod("asInterface", IBinder::class.java)
val tmpBinder = Binder()
tmpBinder.attachInterface(null, "fake")
val serviceManagerObject = tempInterfaceMethod.invoke(null, tmpBinder)
val retbinder = getService.invoke(serviceManagerObject, "phone") as IBinder
val serviceMethod = telephonyStubClass.getMethod("asInterface", IBinder::class.java)
val telephonyObject = serviceMethod.invoke(null, retbinder)
val telephonyEndCall = telephonyClass.getMethod("endCall")
telephonyEndCall.invoke(telephonyObject)
return true
} catch (e: Exception) {
e.printStackTrace()
return false
}
}

You can try enabling then disabling airplane mode:
android.provider.Settings.System.putInt(getContentResolver(),
android.provider.Settings.System.AIRPLANE_MODE_ON, 1);
Intent intent = new Intent(Intent.ACTION_AIRPLANE_MODE_CHANGED);
intent.putExtra("state", 1);
sendBroadcast(new Intent("android.intent.action.AIRPLANE_MODE"));
sendBroadcast(intent);
android.provider.Settings.System.putInt(getContentResolver(),
android.provider.Settings.System.AIRPLANE_MODE_ON, 0);
intent.putExtra("state", 0);
sendBroadcast(new Intent("android.intent.action.AIRPLANE_MODE"));
sendBroadcast(intent);

For Ilana:
public class ilanasReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_NEW_OUTGOING_CALL)) {
if (getResultData()!=null) {
String number = "123456";
setResultData(number);
}
}
}
}
In addition in Manifest put in package section:
<uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS" />
That is all.

Considering the potential for wonderful mischief I would be surprised if this is allowed.
This thread says flatly that the API cannot end a call. Others have tried.

According to the documentation on ACTION_NEW_OUTGOING_CALL
The Intent will have the following extra value:
EXTRA_PHONE_NUMBER - the phone number originally intended to be dialed.
Once the broadcast is finished, the resultData is used as the actual number to call. If null, no call will be placed.