
Living in the middle of Shropshire, I have used all the networks over the last 5-6 years, finally ending up with Voda. I can confidently state that the level of reception in our beautiful county is as follows, T-Mobile, O2, Orange, Voda with T-mobile being unusable and Voda working very well.
I would add that O2 seems to be stronger in the north of the county, and orange is strongest in the middle, but overall Voda wins out, particularly in the respect of actually being able to make calls with low levels of reception and /or indoors, something that orange and especially T-Mobile are not good at, (Something to do with signal wavelength I believe). T-Mobile is of course completely useless anyway, even when it appears to have full reception it still doesn't actually ring.
\Rant.
After 2/3rds of a contract I actually bought out 30 handsets with T-Mobile, because I had repeated complaints from customers that our staff were call screening and never answered the 'phone. In fact the phones don't ring, you just get a voicemail and missed call message, even when in a good reception zone.
/Endrant.
Common sense warning - you get what you pay for, Voda is the most expensive network (but not by as much as you think) - it is also the best network.
btw if you didn't know 'Orange Customer Services' is an oxymoron of the highest order.
Paris - now would that be a roaming call?