Question

I am developing an application that I need to find user phone number.
I founded Telephony Manager but this class does not guarantee that the phone number always returns.so i want to know is there any solution(probably not a straight solution that can i give users phone number because the number does not coded on sim card) in android?

Answer 1

Only few service providers provide phone number via getLine1Number() method. Instead you can get a unique number for each sim using getSimSerialNumber() method.

Ask the user to enter phone number, you can store his simnumber using getSimSerialNumber();
Then authenticate depending on the sim number, this should solve your problem