After starting the emulator, open terminal or command prompt and then enter following commands,
telnet localhost 5554 ( This will connect your emulator )
phonenumber (your_desired_phone_no)
Within this 2 commands you will be able to change your emulators phone number
Additional step;
When you connect emulator, and if you get this, Android Console: Authentication required Android Console: type 'auth <auth_token>' to authenticate Android Console: you can find your <auth_token> in
then go to your directory and search for .emulator_console_auth_token, open that and copy the auth number and open terminal again connect to emulator and enter below command,
this will work. 😊