There is no area code 777 in North America (USA, Canada, etc.).
There are several possibilities:
- The Caller ID data somehow got corrupted on its way to your phone.
- It is relatively easy to send fake Caller ID data through the system.
- Some VoIP services send fake Caller ID on calls from internet users.
- The number could be in Cuernavaca, Mexico, which is area code +52 777.
- The number could be in Kazakhstan, which is country code +7.
