How can I get my Android device country code without using GPS?

You shouldn't be passing anything in to getCountry(). Remove Locale.getDefault():

String locale = context.getResources().getConfiguration().locale.getCountry();

You can simply use this code,

TelephonyManager tm = (TelephonyManager)this.getSystemService(Context.TELEPHONY_SERVICE);
String countryCodeValue = tm.getNetworkCountryIso();

This will return 'US' if your current connected network is in the United States. This works without a SIM card even.

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