What City has UK area code 44702 or 447031?
Any UK telephone number beginning with +44 70 in international format, or beginning with 070 in UK domestic format, is a personal "follow-me" number that can be forwarded to anywhere in the world. Note that charges to dial these numbers may be substantially higher than charges to call an ordinary landline number in the UK.
UK telephone numbers beginning with +44 74 through +44 79 (or 074 through 079) are mobile phones.
(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.)
Most people learn their area code as children, when they're old enough to remember their home telephone number. Older telephones will have a label that shows the telephone number with the area code. Your phone bill will have your number with the area code. You can look up the area code for your city or another city on the web.
North American (USA, Canada, etc.) area code 843 is the coastal third of South Carolina, USA, including the city of Charleston. To dial a local number in area code 843, dial the 7-digit local number. If there is local dialing from a city or town near the boundary of area code 843 into a city or town in an adjacent area code, you may need to dial the area code plus the 7-digit number.