What is +790 country code?

The +790 country code is not a country code. It is actually a Russian mobile phone code that is used exclusively by mobile network operators in Russia. When dialing a Russian mobile number, the +7 country code is used followed by the mobile code, which can vary depending on the network operator. The +790 code is primarily used by the mobile network operator, MTS, but there are other operators that also use this code for their mobile numbers.