My first number was when I was on Orange Pay-as-you-go which I changed between a few different handsets, but then when the iPhone 3G came out (July 11th 2008) I took out a contract on that and CBA to PAC my number over so I got a new O2 number for that.
Only problem with it is that because I was <18 when they came out the contract is in my mother's name (I couldn't take out a contract and doubt I'd have passed a credit check anyway) and I can't seem to find a way of changing the contract to be in my name now I'm >18
... despite the fact that all along the £35 p/m has been my money!
they were 4 digit codes ( 10 digit numbers ) my 0831 xxxxxx became 07831 xxxxxx
Yeah I remember when my Dad's was 0973 on Hutchison Telecom but then became Orange and then got changed to being 07973.
Still got one of his original handsets somewhere..