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

Question

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.

Related documentation from Google: https://developer.android.com/training/articles/user-data-ids.html also see https://developer.android.com/training/articles/user-data-ids.html#g_manage_telephony_&_carrier_functionality — Morrison Chang, Sep 22 '17 at 07:42

chandrakant sharma · Accepted Answer · 2017-09-22T07:45:07.683

2

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"/>

edited Sep 22 '17 at 07:45

answered Sep 22 '17 at 07:36

chandrakant sharma

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Is this a standard practice ..using Device ID ? – dhiraj kumar Sep 22 '17 at 07:42
yes, its works and its standard practise. and if you find my answer helpful please mark it as accepted answer – chandrakant sharma Sep 22 '17 at 07:43

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

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