How to track the mobile number in android.?

The answers given by Henna Wadhwani and Mohammed Goma is technically correct, but practically in most cases this returns null as the operators not store the number in sim cards.

TelephonyManager tMgr =(TelephonyManager)mAppContext.getSystemService(Context.TELEPHONY_SERVICE);String mPhoneNumber = tMgr.getLine1Number();

Required Permission:

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

TelephonyManager tm = (TelephonyManager)getSystemService(TELEPHONY_SERVICE); String number = tm.getLine1Number();

First tap on "settings" then select "About Device" then tap "status". There you will find the registered Carrier and also the registered phone number of the smartphone.