T-mobile was my first network. I used them for a few years and there wasn't any problem with them. Now, I am with Vodafone and also used O2 and 3g service. Now, I can say T-mobile was the best by far. In terms of signal quality and support.

I agree.

I was with with T-Mobile on my last contract, and i never once had a problem. The signal strength was amazing..in fact i don't remember it ever failing, the contract was value for money and their telephone support was outstanding.

Also if i made a call, I could check on my Account on the internet and it would be registered there within minutes.

Since I have my iPhone and have been forced to switch to O2, I suffer from frequent loss of signal, and it takes up to 48 hours to update call info to my account. Are o2 living in the dark ages or what?

I love my iPhone (despite its obvious failings) but O2 suck quite monumentally.