How can I get the country (or its ISO code)?

There are always huge discussions about this, and I never understand why developers and companies go for the complex way. The language selected by the user, means the language he/she wants to see always in his/her phone. They don't intend to have apps in a different language than others or the system.

The choice is very straight forward: Use Locale (to get the language the user selected as preferred), or make your best to piss them off showing them information in a language they already said they don't want to see things in.

To get the country code use:

Locale.getDefault().getCountry();

Use:

TelephonyManager tm = (TelephonyManager)getSystemService(getApplicationContext().TELEPHONY_SERVICE);
String countryCode = tm.getNetworkCountryIso();

It is better than getSimCountryIso because getSimCountryIso depends on the operator to burn the country ISO into the SIM and it also supports CDMA networks.