On the Road Again!

3. The home signal is definitely as bad as O2 but everywhere else it is about the same. On the train journey home, there is a signal at 3G and occasionally 4G where the O2 SIM had nothing, so the £6.75 a month it is saving me could be roughly called a success.....

After several years with O2 I have moved to 3 for a year at least.  The signal is about the same as O2 at home, poor, but the monthly charge is 25% less and for that I get "eat as much as you can" data, which is a bonus. We'll see how it goes!