My Experience with 3
My experience with 3 has been somewhat different than some. In a good way.
Initially when I joined them 4 years ago it was pleasant but the phone I chose for myself and my wife was not great. It was a Nokia Slide and it was rubbish. Getting it changed or cancelling the contract became a nightmare and confusing as it and a new handset and contract also became live at the same time. Resolving the problem, plus the fact they had done 5 credit searches, became too much of a problem. Eventually after pulling out all my hair we fixed it. Got an N95 8GB and SE C902.
Then came time for an upgrade. Got an E71 for myself and C905 Plus for my wife. Great. Problem came for me when I could hardly use my phone at work due to a lack of signal. I was in a blind spot (I had moved jobs). After having signed the new contract only 2 months earlier it wasn't looking good. 3 telephone calls later and I had a great result. They cancelled my contract with no penalty to pay. Lovely.
However, they now were adamant they wanted the handset back. Told them regular stuff about contractual issues and that the phone was not their property. 9 calls worth of frustration later they eventually relented. They also offered me a loyalty discount to make my 500 X-network credit and 1GB only cost me £5 so I could use the phone in the evenings where I did have a signal.
2 months ago I lost 3g signal at home. Called tech support and the first guy although trying to be helpful wasn't. Eventually got a call from their level 3 tech who diagnosed the problem to be with their cell and arranged the dispatch of an engineer. Offered me 7 days of credit without asking for it, even though I was now connected to T-Mobile's 2G network.
Recently got my N8 on the One Plan, plus an extra 2GB of data all for £18/mth. Great deal! First handset turned out to be 'made on Friday' and was promptly replaced. New one arrived and old taken back.
So all in all it has been a mixed bag for me. I am generally satisfied with their service. I like their new policy of not publishing unlimited data plans and I have enjoyed their 3G signal, which on the whole has been steady and stable. Calling them for service and support hasn't always been easy, but then I can't remember calling any major company and having my problem addressed promptly - Nokia, BT, my bank, ISP, local council and the list goes on.