o2 still have the smallest 3g coverage area as the recent crowd sourced maps from the BBC show.
If you head for T-Mobile you’ll find their 3G coverage is almost as good as 3’s due to their network sharing joint venture. You still have backup of 2G on T-mobile and free roaming on Orange in the areas where T-Mobile hasn’t got 2G coverage.
In practice this means you pretty much get coverage everywhere – I’ve noticed that in many places my iPhone has coverage on T-Mobile or Orange whereas Mrs FJ and I’s work blackberries (on o2 and Voda) don’t have any signal at all – in 10 months I’ve yet to find a place where the converse is true.
If you fancy t-mobile you could sign up via http://www.topcashback.co.uk to get £30 cashback on a tariff at e2save – select the deal below to get 600 minutes a month and unlimited web for 99p a month with cashback and just throw away the phone:
e2save cheapest deal
The effective cost of this over 18 months is (18 x .99p) less the £30 cashback from TopCashback, so -£12.18 in total.
Not sure anyone on this thread will manage to top you actually getting paid £12.18!