I'm just about to come to the end of an 18-month contract with BT Fusion and
don't want to have a contract with anyone anymore as it's too expensive
(wife and me hardly use mobiles really - when we do it's just for a couple
of minutes at a time, and we bloody HATE texting; can't get to grips with it
at all).

Apparently we get to keep the handsets we have (Nokia 6136) and I reckon
that the way we use them, a ten-quid top-up will last us at least three
months, maybe a lot longer, so my question is, which network is best for
"long-lasting top-ups"?

In other words, I don't want to get a ten-quid top up and find that it
expires after a couple of months because I haven't used it. It is possible
that I may not even make ten-quids-worth of calls in an entire year so are
there any networks where it would still be active after that length of time?

TIA,

John