Lo people
A few of you know.. I drive a lot. Over 1000 miles per week, all UK.
I have had an EE phone for over a year on a work contract and I personally have a giffgaff sim in my own phone. (O2 network)
the difference in 3d speed is astonishing.. with EE I can nearly always get some form of connection. With Giffgaff, regardless of the signal strength showing, the download speed is up and down like a fiddlers elbow. It can start,.. stop.. fail... or never begin.
I swapped sims over from phone to phone for a day.. it's not a phone issue. The O2 network is rubbish for data.
However, the 2g signal for texts is good. Calls are less good.. they clip and cut when signal is still there but for text it's fine.
I now have a Voda sim. I'm 3 weeks and 3000 miles into it.... It's literally half way between the two in terms of 3g effect. I do need however to reboot the phone daily if I want 3g reliably.
I FULLY understand why you can get a GiffGaff sim so cheaply with lots of data.. unless in a town, with awesome signal.. you cant use it.