The phone code 420 at the beginning of the phone number +420 (subscriber’s phone) means that you are being called from Czech Republic or you are calling a subscriber registered in Czech Republic.
+420 — Czech Republic
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Telephone Code +420 — what country it is
The international phone code +420 officially belongs to Czech Republic, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “420″ after the “+” sign to call to Czech Republic. Then the next digits of the phone number can be entered.
Whose country code is +420?
+420 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Czech Republic. 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.