I haven't got to the bottom of the battery problem life on my phone yet. This is the history:
- purchased from Three, operated fine for a few months
- got ICS update
- got unlock code from Three
- replaced Three SIM with O2 SIM
Battery life on the phone was good originally. And also after the ICS update, I think it was better then.
Now - the battery life problem may have started when we switched to the O2 SIM. Is that possible ? Basically from what I can see, the phone is not going to sleep, it is almost always awake.
Could the change to O2 be the cause ?
Is it possible to revert the phone back to how it was originally (no ICS, no additional apps etc). If I can put it back into that state, then we can go forward again step by step. First change would be the O2 SIM.
EDIT: I have a backup in PC Companion from 29th April. That looks like an easy route. If I restore that backup, do I lose photos etc taken after that date ? Will that restore it back to pre-ICS ?
EDIT: Or perhaps less drastic, put the Three SIM card back in for a couple of days and see what happens. Easiest way to eliminate O2 as the potential problem.