The International dialing code calculator will show how to dial between two locations in the world, with local area codes, trunk prefixes and international country codes

An international call prefix or dial out code is a trunk prefix used to select an international telephone circuit for placing an international call.It is now called an IDD prefix (international direct dialing) – a country will typically have an NDD pref

An international dialling prefix is a telephone dialling code used to dial out of a country when making an international call. It's also called international access code, International Direct Dialling (IDD) code, exit code, international call prefix,