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The country code and area code of Casablanca, Morocco is 212, (0)2.
The country code and area code of Rabat, Morocco is 212, (0)3.
The country code and area code of Solingen, Germany is 49, (0)212.
The country code and area code of Vitebsk, Belarus is 375, (8~0)212.
It stands for the telephone area code for Manhattan, NYC.
"I was in the 212" means "I was in Manhattan".