Here are few of the most known british phone directories online http://www.whitepages.com/10583/?s_kwcid=TC|5984|free%20phone%20directory||S|b|4050035930, http://www.thephonebook.bt.com/publisha.content/en/search/residential/search.publisha, http://www.ukphonebook.com/, http://uk.dir.yahoo.com/Reference/Phone_Numbers_and_Addresses/,  http://www.192.com/, http://www.infobel.com/en/uk/default.aspx.



Here you can find information regarding that phone number, name of the owner, address, maybe other useful information also. In this free UK phone directories you could search for businesses addresses and phone numbers.
Typical formats of UK phone numbers are like these ones (01xxx) xxxxxx, (01x1) xxx xxxx, (011x) xxx xxxx, (02x) xxxx xxxx, 03xx xxx xxxx, 07xxx xxxxxx, 08xx xxx xxxx, 09xx xxx xxxx



Area codes in United Kingdom are from two, three, four or rarely five digits long (after an initial zero). The larger cities have assigned a shorter area code because these enable a larger number of telephone numbers to be used. The total number of digits in all area is almost always ten, but there are also areas where there are numbers  with nine digits (after the initial zero).

The area code is also referred as (subscriber trunk dialing - STD), or dialing code. The largest area from  UK – Northern Ireland has allocated (028). The UK numbering plan applies to three British Crown dependencies – Isle of Man, Guernsey and Jersey. To dial the United Kingdom from overseas you should follow this recommendations according to recommendation E123 agreed upon by Ofcom, and ITU-T: +44 16977   xxxx  - Brampton, +44 1386  xxxxxx – Evesham, +44 1204   xxxxx  - Bolton, +44 1865  xxxxxx – Oxford, +44 131 xxx xxxx –Edinburgh, +44 151 xxx xxxx – Liverpool, +44 116 xxx xxxx – Leicester, +44 113 xxx xxxx  - Leeds, +44 29 xxxx xxxx – Cardiff, +44 1382  xxxxxx - Dundee, +44 15396  xxxxx – Sedbergh, +44 20 xxxx xxxx - London

When storing any UK phone number in your mobile phone address book or when you are dialing it from the keypad in the correct +44 international format (without the leading zero) allows to work when you are calling it from any place in the world.  Your phone system is programmed to correctly and automatically replace the plus sign with the correct International Access Code.



For use in television shows and cinema phone companies have allocated a range of numbers to avoid real numbers of people and businesses to be dialed by fans. This is similar to the use of telephone numbers with the 555 digits in United States. In large cities with three digit area codes are reserved usually the ones starting with the 496 digits. In other areas the code for fictional numbers is 01632. There are also reserved ranges for fictional freephone, premium rate and cell phone numbers. So you better check twice if someone try to play a prank on you telling that you have won jackpot a luxury travel from UK but you should call number to confirm your personal data. OK, I know the prizes like that don’t fall of the sky, I was trying to illustrate a fictional situation.
As you have read in my article you should know which area a cell phone number belongs to if you have only the number, to know how to conduct your search to get a better result.