I've noticed no difference in battery life on my 4 after iOS 5.
Though I've got a weird issue when reflashing my phone. Once it clears the old OS the computer doesn't recognize the phone and it won't recover until I plug it into a different computer. I've checked that all the services are running in the background but it doesn't make a difference. I've re-installed iTunes a few times and nothing helps.
Last edited by burn_this_city; 10-25-2011 at 04:12 PM.
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