Since switching to gifgaff from Vodafone I have noticed two things.,
1) Internet is now much, much cheaper
2) Internet is now much, much, much less reliable
I did some tests with a friend on O2 (Samsung Galaxy S2) and he suffered the same problems at the same times. Frequently 3G appears to be up but no data flows. Forcing the phone back to 2G only gets a data connection at these times but at only a few bytes per second averaged out (yes really) probably because most of the phones in the cell are also trying to fall back to 2G completely overloading the system.
I've also done a few tests with an Orange SIM and that seems much better. I am now contemplating dropping giffgaff and trying out the 1 GB on Vectone for a fiver deal as Vectone use Orange/T-Mobile networks.
I use my G300 a lot to listen to Internet radio and watch live streams and that eats bandwidth but I can probably restrict myself to 1Gb a month without too much trouble as most of the time I am on wifi.
I am sure some areas have better coverage than others but overall I am very unimpressed with the underlying O2 network.
Edited by Hogweed, 02 August 2012 - 01:58 PM.