To call a mobile phone in United States from Guantanamo Bay use the following dialing code format: 00 + 1 + The Number Click here to search for another mobile country code.
The Maryland, United States area code chart below gives you the necessary information for calling Maryland cities. For international dialing instructions to Maryland, United States, use our drop down boxes at the top of this page or check out our easy-to-use country code search tool.
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