Question

How can I retrieve a user’s country code on Android? Do I need permissions?

Answer 1

To get the country code stored in the sim card of the phone you can try

TelephonyManager telephonyManager = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
telephonyManager.getSimCountryIso();

You can try also:

 Locale locale = Locale.getDefault();
 locale.getCountry();

This returns the data from the language/Country stated from the user and not the physical location.