How to Get Phone Number from an Incoming Call

How to get phone number from an incoming call?

Make a Broadcast receiver say ServiceReceiver assign its action in Manifest.

<receiver android:name=".ServiceReceiver" >
    <intent-filter>
        <action android:name="android.intent.action.PHONE_STATE" />
    </intent-filter>
</receiver>

Add a PhoneStateListener to your TelephonyManager, PhoneStateListener having override onCallStateChanged() with Incoming number parameter. Thats it.

ServiceReceiver.Java

public class ServiceReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(final Context context, Intent intent) {
        TelephonyManager telephony = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
        telephony.listen(new PhoneStateListener(){
            @Override
            public void onCallStateChanged(int state, String incomingNumber) {
                super.onCallStateChanged(state, incomingNumber);
                System.out.println("incomingNumber : "+incomingNumber);
            }
        },PhoneStateListener.LISTEN_CALL_STATE);
    }
}

How to get incoming call number? [Android]

Please note you need permission READ_CALL_LOG if you want to get incomingNumber, you can check documents here

String: call phone number. If application does not have READ_CALL_LOG permission or carrier privileges (see TelephonyManager#hasCarrierPrivileges), an empty string will be passed as an argument.

Get the callers phone number from an incoming call on iPhone

###EDIT###

iOS 10 and above:

Use Callkit, take a look at call directory extension

According to documentation,

Identifying Incoming Callers

When a phone receives an incoming call, the system first consults the user’s contacts to find a matching phone number. If no match is found, the system then consults your app’s Call Directory extension to find a matching entry to identify the phone number. This is useful for applications that maintain a contact list for a user that’s separate from the system contacts, such as a social network, or for identifying incoming calls that may be initiated from within the app, such as for customer service support or a delivery notification.

For example, consider a user who is friends with Jane in a social networking app, but doesn’t have her phone number in her contacts. The social networking app has a Call Directory Extension, which downloads and add the phone numbers of all of the user’s friends. Because of this, when the user gets an incoming call from Jane, the system displays something like “(App Name) Caller ID: Jane Appleseed” rather than “Unknown Caller”.

To provide identifying information about incoming callers, you use the addIdentificationEntry(withNextSequentialPhoneNumber:label:) method in the implementation of beginRequest(with:).

class CustomCallDirectoryProvider: CXCallDirectoryProvider {
    override func beginRequest(with context: CXCallDirectoryExtensionContext) {
        let labelsKeyedByPhoneNumber: [CXCallDirectoryPhoneNumber: String] = [ … ]
        for (phoneNumber, label) in labelsKeyedByPhoneNumber.sorted(by: <) {
            context.addIdentificationEntry(withNextSequentialPhoneNumber: phoneNumber, label: label)        
        }

        context.completeRequest()
    }
}

Because this method is called only when the system launches the app extension and not for each individual call, you must specify call identification information all at once; you cannot, for example, make a request to a web service to find information about an incoming call.

iOS 9 and earlier:

As Kakshil mentioned, Caller ID is not possible on non jailbroken devices.

And I will give you some findings on how true caller works,

1. Its not reading the call history, they actually created Action
   extension, wherever you try to share a contact, it will display
   truecaller app extension, which coded for showing the contact
   details fetched from their server

2. You might also get confused with push notification received for few
   calls, saying
   "Some X calls you". This is where truecaller used a trick. If you
   noticed clearly, that push notification will be received only when
   you get a call from an android user with truecaller installed. Let
   me explain you in details,

X(android user with truecaller installed), calling Y(ios user with truecaller installed), the android version notify the server that X making call to Y. And server will send push notification to Y's iPhone.

Get incoming call number programmatically on android

Try this way...
permission

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

Make a Broadcast receiver say ServiceReceiver assign its action in Manifest.

<receiver android:name=".ServiceReceiver" >
<intent-filter>
    <action android:name="android.intent.action.PHONE_STATE" />
</intent-filter>

ServiceReceiver.Java

public class ServiceReceiver extends BroadcastReceiver {

@Override
public void onReceive(final Context context, Intent intent) {
    TelephonyManager telephony = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
    telephony.listen(new PhoneStateListener(){
        @Override
        public void onCallStateChanged(int state, String incomingNumber) {
            super.onCallStateChanged(state, incomingNumber);
            System.out.println("incomingNumber : "+incomingNumber);
        }
    },PhoneStateListener.LISTEN_CALL_STATE);
}

}

On Android how do I get the phone number from incoming call?

In order to get this to work in newer versions of Android (4.0.3 etc) you need to make sure that your minSdkVersion is 3.. The issue with my code was that my minSdkVersion was 7..

Hope this helps others trying to figure this out! :)

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