I want my app automatically know user phone number by accessing their SIM Card

Question

I want to build a web based android app. What I want is I want my app to know the user phone number, but I don’t want them to enter it; perhaps, I want my app automatically know their number, by accessing their SIM Card or whatever way. Can you help me please?

Thank you.

Answer 1

Manifest permission:

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

Code:

TelephonyManager manager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
String telNumber = manager.getLine1Number();

this does not mean that it will work on every device. Sometime number is just unavailable.