That's the beginning of a mobile number. Any UK number beginning with 07400 through 07999 is a mobile. That's +44 7400 through +44 7999 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.)
All numbers in the United Kingdom beginning with '07' are for mobile phones, pagers and personal (follow-me) numbers. They are not linked to any particular geographic area and could be anywhere in England, Scotland, Wales or Northern Ireland.
078 will normally be a mobile phone.
A UK telephone number beginning with 079 (or +44 79 in international format) is a mobile phone.
Note that calls to a UK mobile phone are billed at rates that may be substantially higher than calls to ordinary UK landline numbers.
(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.)
In the UK, that is a mobile phone number. 07761 xxx xxx numbers are allocated to operator O2, although an individual subscriber can port a mobile number to a different operator.
In international format, 07761 becomes +44 7761.
(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.)
In the UK, 07895 is a mobile number. In international format, it's +44 7895.
(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.)
A UK telephone number beginning with 079 (or +44 79 in international format) is a mobile phone.
(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.)
This is part of a UK mobile (cell) phone number so could be anywhere in the country and not necessarily London. In international format, 07813 becomes +44 7813.
A UK telephone number beginning with 07872 (domestic format) or +44 7872 (international format) is a mobile phone.
mobile phone
All UK area codes begin with a 0. There is no area code 6010 in the UK, and there is no 06010 code either.
UK area code 020 is London.
There is no area code 20 in the UK
There is no 01134 code in the UK.
The country code and area code of Aberdeen, United Kingdom is 44, (0)1224.
Cambridge is in area code 01223, or +44 1223 from outside the UK.
In the UK, 0121 is the area code for Birmingham.
Until the early 1990's, area code +44 21 (or 021 within the UK) was Birmingham, which is now area code +44 121 (or 0121 within the UK). There has never been an area code +44 217 (or 0217) in the UK.
The area code "029" is assigned to the city Cardiff in Wales, UK.
Slough. There is no 0753 code in the UK.
There is no UK area code like 0491. If the number is pre-1995 then this area code is now 01491 which covers Henley-on-Thames.
UK area code 0161 is Manchester. 0161 644 is an unused prefix.