Fair enough. I'll give them a go for a year and see how it goes. The deal I got was cheap £8 for 80GB with volt benefitsI don't rate O2 much.
I was with virgin that used ee network signal was amazing wherever I went, then Virgin sold out to O2 and since the switch coverage hasn't been anywhere near as good.
I want to go back to Ee but they are quite expensive.
I was running a lebara as a dual sim for a while whilst on three as at work the signal on three was non existant, that was great tbf (Vodafone piggyback)