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.
Telephone country codes never begin with zero.
Country code +20 (dialed as 00 20 from many places) is Egypt, and a number beginning with +20 3 is in Alexandria. Most numbers in Alexandria begin with +20 3 2 or +20 3 3, with seven further digits.
(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.)
020 is the area code for London; all UK numbers beginning with 020 are London numbers.
East Mansfield, MA
02031111163
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 Karoi is 064, or +263 64 in international format.
The telephone country code for Zimbabwe is +263. The area code for Chakari is 0688, or +263 688 in international format.
It has the area code 082.
Area code of Banepa is 011
The telephone country code for Zimbabwe is +263. The area code for Glendale is 0376, or +263 376 in international format.
The telephone area code for Kalisizo, Uganda, is 0481, or +256 481 in international format.
The telephone area code for Arua, Uganda, is 0476, or +256 476 in international format.
The telephone area code for Lira, Uganda, is 0473, or +256 473 in international format.