The area code for London is 020, or +44 20 in 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.)
No, area code 352, which spells FLA, is in Gainesville, Florida.
Brooksville, Florida, is in area code 352.
The country code and area code of Kayseri, Turkey is 90, (0)352.
The country code and area code of Florida, Uruguay is 598, (0)352.
The country code and area code of Kohkiluye-Boyerahmad, Iran is 98, (0)352.
The country code and area code of Datong- SX, China is 86, (0)352.
Within North America, nowhere. An area code is unique to a defined area - that's the whole point. Other countries may use 352 as a code within their own numbering space.
This isn't a London code. It is the area code for Brentwood in Essex which is about 30 miles northeast of London.
The country code and area code of La Piedad- Mich., Mexico is 52, (01)352.
The country code and area code of Kurgan region, Russian Federation is 7, (8)352.
London is area code 020.
The country code and area code of East London, South Africa is 27, (0)43.