androidnode.jsfirebase-authenticationaccount-kit

Detect two phones/handset with same phone number after phone authentication/OTP

If I use phone A's number to verify an app'X' on phone B. And then install app'X' on phone A and verify the app with its number, Then I have verified two handsets with same mobile number. How can I detect this on the server and restrict such operation ? This can usually happen when the user owns both the handset/phones.

Solution

  • you can get the IMEI Number of both phones by this code :

    TelephonyManager telephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
String IMEI = telephonyManager.getDeviceId();

    and check that the IMEI Number is differ for both phones because IMEI number is unique for every device.

    And you should add the following permission into your Manifest.xml file:

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