To call Mexico from California first the international number is 011 then the country code is mostly 52 (Baja for sure) then if it is a cell phone you need to dial 1 then the area code mine is 646 (Ensenada {Baja California}, Mexico). Then the reg 7 digit number 999-9999.
So recap: 011 52 646 999-9999 {{calling a residence or business}}
011 52 1 646 999-9999 {{calling a cell}}
So recap: 011 52 646 999-9999 {{calling a residence or business}}
011 52 1 646 999-9999 {{calling a cell}}