get phone number

Button btnPhoneNumber = (Button) findViewById(R.id.btn_phonenumber);
btnPhoneNumber.setOnClickListener(new OnClickListener() {

    public void onClick(View v) {
        String number = ((android.telephony.TelephonyManager)getSystemService(TELEPHONY_SERVICE)).getLine1Number();
        
        Log.i("PHONE", "PHONE NUMBER !!" + number);
        edtResult.setText(number);
    }
});