The UK area code for Portsmouth, England, is 023.
In 2000, Portsmouth changed from area code 01705 with 6-digit local numbers, to area code 023 with 8-digit local numbers. 01705 xxx xxx changed to 023 92xx xxxx. This change led some people to erroneously refer to the new code as 02392, but in fact the area code is 023.
At the same time, Southampton numbers changed from 01703 xxxxxx to 023 80xx xxxx.
In more recent times, Portsmouth has started using the 93xx xxxx number range and Southampton has started using the 81xx xxxx and 82xx xxxx number ranges.
It remains true that all Portsmouth local numbers begin with 9. Local numbers in area code 023 beginning with 8 are in Southampton. Although Portsmouth and Southampton share an area code, calls between them are not considered to be 'local'.
Calling internationally, both Portsmouth and Southampton are in area code +44 23, with 8-digit local 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, and some other countries use different prefixes.)
Portsmouth is in UK area code 023, which is +44 23 in international format. Local numbers are 8 digits.
(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.)
The area code for Portsmouth (and also Southampton) is 023, and is followed by an eight-digit local number.
For example: (023) 9282 2251 is a Portsmouth number.
The 023 code was introduced in the year 2000. Before this date, Portsmouth had six digit local numbers and the area code 01705.
Portsmouth and Southampton use UK telephone area code 023, with 8-digit local numbers. Although Portsmouth numbers begin with 9, it is incorrect to refer to area code 0239 or 02392. Also note that calls from Portsmouth to Southampton, or vice-versa, can be dialed with just the 8-digit local number, although they are not rated as local calls.
In international format, 023 becomes +44 23.
(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.)
01691
01931 is the telephone code for Shap, Westmorland (near Penrith in Cumbria).
UK telephone area code 0161 is Manchester, but 0161 553 is an invalid number block.
UK telephone area code 01954 (or +44 1954 in international format) is Madingley, Willingham, near Cambridge.
A UK telephone number beginning with +44 754 is a mobile.
Portsmouth's area is 15.5 square miles (40.3 square kilometers).
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.
01792 is the area code for Swansea
In the UK, area code 020 is London, but there are no numbers beginning with 020 2. Other countries may have similar telephone area codes.
UK telephone area codes were first assigned in 1958.
UK area code 020 is London, but there are no valid numbers beginning with 020 4, much less 020 43. Also, the area code for London is just 020, not 020x or 020xx. There are no other UK telephone area codes beginning with 020.
00 + 1 + Area code + telephone number.