A UK telephone number beginning 0743 (or +44 743 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.)
A UK telephone number beginning with 0746, or +44 746 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.)
07404 is not a geographic area code, it is most likely a mobile (cell) number. All UK numbers beginning with 074 through 079 are mobile phones or pagers.
The United Kingdom.
UK mobile numbers are not specific to any geographic area, except for the codes used for Guernsey, Jersey, and the Isle of Man.
Slough
A UK telephone number beginning with 074 is a mobile phone.
There is no such geographic area code in the UK. All UK geographic area codes start with 01 or 02. Numbers beginning 074, 075, 07624, 077, 078 and 079 are for mobile phones.
In the great telephone renumbering known as phONEday, all geographic (landline) area codes added a 1 at the beginning, to provide the flexibility to rearrange other numbers into more sensible groupings. Prior to phONEday, mobile codes were interspersed randomly amidst the geographic landline codes; mobile numbers are now separated out into the 074-through-079 range.
The UK area code 07924 (or +44 7924 from outside the UK) is a mobile specifically on the Isle of Man. More generally, any code beginning with 074 through 079 is a mobile.
UK mobile numbers begin with 074 through 079, which is to say +44 74 through +44 79 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, and many other countries use different prefixes.)
Donegal is in the Republic of Ireland, not Northern Ireland. Its area codes are 071 and 074.
Kilcar in County Donegal, Ireland, is in area code 074, which is +353 74 in international format.
074 = 74 is bigger than 7.
Most of County Donegal is in area code 074, but the southern bit, including Ballyshannon, is in area code 071. In international format, that's +353 74 or +353 71.(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, and many other countries use different prefixes.)
Letterkenny, and most of County Donegal, is in Irish area code 074, which is +353 74 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, and many other countries use different prefixes.)
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.)
invalid codeThere is no area code 079 (i.e., +353 79 in international format) in the Republic of Ireland. Area code 071 is Sligo, and 074 is Letterkenny and Donegal. There are no other 07X or 07XX area codes in Ireland. (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, and many other countries use different prefixes.)