T-Mobile = bad signal
I was with T-Mobile on PAYG for 3 months, and I couldn't get a signal at all at home which was kind of a problem. I phoned them up and they said "yeah we know the signal's cr*p in that area; but we're not going to do anything about it because not enough people have complained."
So I switched to Vodafone - been with them for nearly 5 years, only had 2 places where I haven't had a signal - once was in the London Underground, the other was up north in the middle of nowhere for about 5 minutes until my phone found another transmitter.
My room-mate has exactly the same problem as I had on T-Mobile - and guess who she's with? Orange. Yep, if they've really got over half the available bandwidth, they're not using it very well.
Esc - because T-Orange should escape now; they're getting none of my business.