Well i have had mine nearly a year and to start it was pony but now i live in canvey get full "3" signal work in wembley full signal after 2 weeks of charging the battery it now lasts 2 days and i've never not had full signal for at least the last 4 months so i have noticed the diff as they upgraded the reception things????
plus for £35 a month i get 750 cross network mins and i have never used them all plus i think it was for an extra £5 a month i could text all i like for free too
i was deffo going to cancel after the year but now i'm going to stick with em as they are coming forward leaps and bounds
hth

Martin