Text PAC to 65075 from your O2 phone and the code arrives in a minute. Here is what to do when it does not, and what to check before you switch.

No UK network lets you pick your own mobile number. Here is why, and the one route that actually lets you choose the digits.

Text PAC to 65075 and your network must send the nine-character code back within a minute. Here is how to use it, what happens on switch day, and what to do when it goes wrong.

Why eights and 786 command a premium on UK mobile numbers, why fours narrow the market, and what cultural demand really does to price.

What a UK mobile number is actually worth, the four value bands, why published figures disagree, how to sell safely, and the fraud risk to understand first.

Which 07 ranges are genuinely mobile, why 070 and 076 are not, and why no prefix can tell you which network a number is on today.

What premium and VIP mobile numbers really are, what the UK price bands are, how porting works, and the checks to make before you buy.