I have been with o2 for years and had paid off my 2 year contract kept the sim.
For years my bill was the same. Now I have had a bill for £650
Poor service, as I apparently phoned another network !!! Get real 02 and goodbye, I apparently didn't have it capped ?? I did when I bought it. Rip off o2. Other networks are in the real world of any network. !!!!!!! ????????????????