Ive been with T-mobile for a year and seem to get good reception around the Brighton area, they also have a set up with Orange where if you can't get T-mobile reception it switches you to the Orange network so you can still get calls etc.
Mine was at 3.30, the whole thing including purchase of tickets was about an hour, although I was quite lucky as the people at my presentation were only buying 2-4 tickets and most people knew where they wanted to go.
I think it's a good idea, put something back into local football/community . Will probably be a decent crowd as a lot of people will want to go just to see the stadium. Although I think I will wait until 06th August.