android - get user phone number

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I want to get the user phone number. I user code from previous answer here (old one) :

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

in the activity : 
TelephonyManager tMgr = (TelephonyManager)this.getSystemService(Context.TELEPHONY_SERVICE);
        String mPhoneNumber = tMgr.getLine1Number();

running this on my phone, gives me null String. in which case it happen , and maybe there is others option?

asked 1 min ago

user1932595

159

android - get user phone number