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Telephones
The country code for the United States is 1. The area code for Baltimore is 410. You do not need to dial the three-digit area code when making a call from within the same code.
Directory & Operator Information
For operator assistance, dial "0."
International Calls
International calls can be direct-dialed from most phones. If you're dialing Canada from the United States, dial 1 plus the area code and telephone number. If you're dialing the United States from Canada, dial 1 plus the area code and telephone number.
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