It will have changed a lot in 4 years ...
Use the Ofcom Sitefinder to check where the UMTS Transmitters are in the Brighton area, visit the link below, double click on the UK map, then enter your postcode. This will zoom the map into your area, the transmitters or base stations show up as blue triangles, double-clicking on a blue triangle will show the name of the operator (ie. Orange, Three, Vodafone, O2, etc) other details about the height and power output of the antenna, and the type of transmission. This will either be GSM or UMTS. For mobile broadband internet (3G, or 3G plus, or HSDPA) you need a UMTS transmitter.
The Ofcom website may not show all the operators in your area, I don't know why this is, I did find out that their sitefinder is updated every 3 months and that the operators supply information to Ofcom on a voluntary basis. If you'd like to see what your base station looks like you can navigate to the same location in google maps then select satellite view and zoom in to street level view. Mine looks pug-ugly, about 7 antennas on top of a hairdresser's shop.
One other thing is I wouldn't sign-up for a contract before trying out the service first, If they allow you a honeymoon period OK, if not you'd be better off buying a PAYG dongle with 1GB data allowance for 35 quid, if you get good service on that you should get the same service on the contract. Might save a lot of heartache later on.
http://www.sitefinder.ofcom.org.uk/
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Edited by NVB (Fri 15-Jan-10 16:15:39)