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I am trying to get my own number in android. I search on internet and I found that if your number is not available in Settings>About Phone>Status>My phone number it shows unknown then by using below code you cannot get phone number. I have also added permission

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

TelephonyManager tm = (TelephonyManager)this.getSystemService(Context.TELEPHONY_SERVICE);
String mPhoneNumber = tm.getLine1Number();

here is my phone screen shot

enter image description here

Now I don't know facebook app gets my phone number correctly.

Here my facebook sign up screen.

enter image description here

can someone please tell me how facebook is able to get phone number.

Ashish Kudale
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