[Shaun]

Originally Posted by driver_problems

where do you find that t-mobile is dodgy? - which areas? - we have just taken this network on and seem to find it ok where we are - but it may be a concern

Network coverage
All the 2G networks give reasonable coverage within the UK, but if you live or work in less densely populated areas you could well experience problems with any network. Generally speaking, Vodafone and O2 still seem to provide the best coverage, and T-Mobile lags some way behind. The Orange and T-Mobile signals are often believed to work less well in buildings, because of the higher frequency of their signals (see below). The networks publish maps showing how well they cover the country, but these are of little practical use to users. The best advice is probably to ask friends or colleagues in your local area how they find the signal strength of the various networks.

http://www.mobile-phones-uk.org.uk/networks.htm