+44 is the telephone country code for the UK. A number beginning with +44 78 is a UK 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.)
+44 is the telephone country code for the UK, plus the Channel Islands and the Isle of Man. However, a telephone number beginning with +44 7839 (or 07839 in domestic format) is a mobile phone specifically from the Bailiwick of Guernsey. Landline numbers in Guernsey begin with +44 1481 (or 01481 in domestic format).
Calls to Guernsey may cost more than calls to numbers in the UK proper. Also, calls to mobile phones in Guernsey and the UK may cost more than calls to ordinary 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.)
+44 1480 would correspond to UK domestic area code 01480, which is Huntingdon in Cambridgeshire.
That's a mobile number in the UK, country code +44.
A UK number beginning +44 783 is a mobile.
+44 783x xxxxxx is a UK mobile number.
The country code and area code of Aberdeen, United Kingdom is 44, (0)1224.
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.
Country code +44 is the UK, and +44 3 is an all-UK number.
Cambridge is in area code 01223, or +44 1223 from outside the UK.
Country code +44 is the UK, and +44 7926 is a mobile code, along with the rest of +44 74 through +44 79.
Country code +44 is the United Kingdom. Area code +44 1303 (or 01303 in UK domestic format) is Folkestone.
The Brighton, UK, area code is (01273), or +44 1273 in international format. Local numbers have six digits.
Witham, Essex, is in area code 01376, or +44 1376 from outside the UK.
Numbers beginning with +44 75 are mobiles in the UK.
Bodelwyddan, Wales, is in UK area code 01745, the same as Rhyl. From outside the UK, that's +44 1745.
Runcorn is 01928, which is +44 1928 internationally.
Holsworthy, Devon, UK