USA Country Code
USA Country Code is used when dialing to USA from outside USA. USA Country Code is however not used when dialing within USA.
To call USA from outside USA, you have to dial the your own country's International Direct Dialing prefix (IDD), USA Country Code, City/ Area Code, and then the subscriber telephone number as:
Your Countries International Direct Dialing Prefix (IDD) + 1 (USA Country Code) + City Area Code + Number you wish to call.
When dialing from a mobile phone outside USA into USA, Dial '+' + 1 (USA Country Code) + City Area Code + Number you wish to call. (The "+" can be reached by holding down the "0" key until it turns into a "+". The "+" is universal prefix for all international mobile telephone calls including USA)
USA International Direct Dialing prefix (or IDD) is used when dialing from the USA to outside the country (Refer to international dialing USA code or USA international access code). Do not use USA IDD when dialing within USA.
USA National Direct Dialing prefix (or NDD) is used when dialing to a destination within the USA (Refer to dialing USA code). Do not use USA National Direct Dialing prefix when dialing from outside USA into USA. USA NDD is only used as long distance dialing within the country.
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