Dialing Guam
The other type of code is Guam National Direct Dialing prefix (or NDD). It is used only when dialing to a destination within the Guam. Guam NDD code is only used as long distance dialing within the Guam. Do not use Guam National Direct Dialing prefix when dialing from outside Guam into Guam.
For Guam long distance, you have to dial Guam National Direct Dialing prefix (or NDD), City/ Area Code, and then the subscriber telephone number respectively as:
+1-671 (Guam National Direct Dialing prefix code) + City Area Code + Number you wish to call.
On the other hand, International Dialing Guam Code or Guam International Direct Dialing prefix (or IDD) is used when dialing from the Guam to outside Guam. Do not use Guam IDD code when dialing within Guam for long distance.
On the other hand, when dialing to Guam from outside Guam, a Guam Country Code is used . Guam Country Code however is not used when dialing within Guam.
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