If this is for a UK phone number totalling eleven digits long, then it's probably a London phone number, as the area code 020 is for London. (The '31' would be the first two digits of the eight-figure local number.)
There are also other countries that have domestic telephone area codes like 02031 or similar.
There is no telephone area code 185 in Russia.
No, telephone area codes are discrete data.
The telephone country code for Zimbabwe is +263. The area code for Beitbridge is 0286, or +263 286 in international format.
Telephone country code +93 is Afghanistan, and area code +93 25 (Afghan domestic telephone area code 025) is the city of Logar, south of Kabul.
The telephone country code for Zimbabwe is +263. The area code for Chakari is 0688, or +263 688 in international format.
The telephone country code for Zimbabwe is +263. The area code for Karoi is 064, or +263 64 in international format.
Area code of Banepa is 011
It has the area code 082.
The telephone country code for Zimbabwe is +263. The area code for Glendale is 0376, or +263 376 in international format.
Mashhad is in Iranian telephone area code 0511, which is +98 511 in international format.
The telephone area code for Bwizibwera, Uganda, is 0485, or +256 485 in international format.
The telephone area code for Gulu, Uganda, is 0471, or +256 471 in international format.