The phone code 52 at the beginning of the phone number +52 (subscriber’s phone) means that you are being called from Mexico or you are calling a subscriber registered in Mexico.
+52 — Mexico
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Telephone Code +52 — what country it is
The international phone code +52 officially belongs to Mexico, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “52″ after the “+” sign to call to Mexico. Then the next digits of the phone number can be entered.
Whose country code is +52?
+52 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Mexico. It does not mean that a subscriber is definitely there at the time of the call (since he or she can make a call in roaming), but there is such a possibility.