3
I've just signed my second 18 month contract with 3 and have found the India based technical staff well informed and able to help every time. Not all the options get you through to knowledgeable staff but my experience has been great. I've even had to send my new N73 back twice (once due to software, the other due to me dropping it) and my other phone back once and every time it's been sent by me (my choice, they did offer to collect ) and delivered back within a week with the proble solved. Even when I had a problem with an unexpected 250 quid bill due to data charges as when you get x series as an add on the 1gig of data has to last you for two months. They removed the charges and now send you a text to tell you when you are approaching your limits.
The shop staff however seemed to know NOTHING about their products and I had to tell them about some features of the x series 3 months after it had come out as the girl in the shop had heard of it but knew nothing about it.