Jeez - I just jumped ship to o2 as my contract was coming to an end and they wouldn't give me a better deal per month that taking out a new starter contract (sim only) with o2... I was on an 18month, £45 a month - you'd think they'd have done something to keep me!

But hey, although o2 isn't truly unlimited, reports of 40gb+ usage being allowed is fiiiine by me! Just downloaded the humble indie bundle through it with no trouble at all :-)