I recently took advantage of the special £5 per month O2 SIM deal, but when I inserted the SIM it changed my number. The O2 shop gave me a number to call to sort it out nbut O2 deny all knowledge of the SIM, not recognising the serial number. Talktalk now tell me I must talk to O2 as they do not issue O2 SIMs !!!!!
So my question is, can I use the cheaper SIM and retain my jumber and if so how do I do it?