Disclaimer: I have never bought a PAYG mobile, always had a contract phone, so I feel out of my depth here
My mam has a pay as you go phone which she has had for.... erm....about 8 years. It's pretty much dead, she has to have it plugged in to make a call. So I thought I'd get her a new phone at Christmas, BUT, she will not want to change her network or number. So, here is the question, if I buy a Tmobile PAYG phone can she just put her sim card in? Will the top up that it seems I HAVE to buy work for her number? Can anyone recommend a fairly simple phone with a camera at the lower end of the price scale?