In North America (telephone country code +1: USA, Canada, etc.), area code 207 is the US state of Maine.
In the UK (telephone country code +44), area code 20 is London. Telephone numbers in the area formerly designated "inner London" changed from area code 171 with 7-digit local numbers to area code 20 with 8-digit local numbers beginning with 7. Although locals will still sometimes refer to "area code 0207," the correct area code for all of London is just 020 (domestic format) or +44 20 (international format).
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
The country code and area code of Astrakhan, Russian Federation is 7, (8)8512.
The country code and area code of Evreyskaya region, Russian Federation is 7, (8)426.
The country code and area code of Lipetsk, Russian Federation is 7, (8)4742.
The country code and area code of Comm. networtk Kalita, Russian Federation is 7, (8)49630.
The country code and area code of Naberezhnye Chelny, Russian Federation is 7, (8)855.
The country code and area code of Barnaul, Russian Federation is 7, (8)3852.
The country code and area code of Penza region, Russian Federation is 7, (8)841.
The country code and area code of Dagestan, Russian Federation is 7, (8)872.
The country code and area code of MCC, Russian Federation is 7, (8)49690.
The country code and area code of Abakan, Russian Federation is 7, (8)39022.
The country code and area code of Adigeya, Russian Federation is 7, (8)877.
The country code and area code of Anadyr', Russian Federation is 7, (8)4272.