I have an iPhone 4 on o2 (UK) and have noticed that instead of getting 4 or 5 bars of 3g at work like i used to i now only get 1 or no bars of 3g, 1 or 2 bars of edge or no service since i installed 6.1.2. As a result i keep missing calls and texts. I have also noticed my battery doesn't last as long as it used to, i don't know if that is just because of 6.1.2 or if it is because the phone is always switching between edge and 3g. Would that reduce battery life much? My wife also has an iPhone 4 on o2 and has noticed her signal isn't quite as good since 6.1.2 but not as bad as mine. Anybody else having the same issues.