I have swapped from orange which I was a customer with for over 7 years. The reception from orange in my area had gradualy decreased to zero. To make a call I had to stand at the back of my garden. My monthly bill from orange was around the £300+ mark. I have since swapped to 3 network and I have gone for the 2000 minutes package for £100 per month.
Inclusive Text Messages (Peak Rate) 300
Inclusive Picture Messages 100
Inclusive Video Messages 100
Reception is far better than my orange ever was and my bill hasn't gone over the £100 mark. In four months I have saved over £900 and I am contactable all the time as the receiption in my area is always on full.
It took me many months to pluck up the courage to swap from orange to 3. The way I looked at it in the end was I had 2 weeks in which to reject the contract if I wasnt happy.
My only gripe is the battery life on the motorola E1000 isnt the best.
Overall I am over the moon with my 3 phone and the savings I am making.
My advice would be to try and make up your own mind.
BTW I live in Epsom Surrey and I spend alot of time in London as this is where my business is set up.