answer:First off, you can’t read e-mail or Twitter with your data off. Just had to get that off my chest! The truth is that iOS 4.3 is buggy and you are not the only one who is affected Some people say that the newer versions are fixed while others report no change with the bug-fixed 4.3.1 The only fixes I’ve seen were here , and I cannot vouch for them as it seems to be a YMMV (Your Mileage May Vary) scenario. BTW, smartphones in general tend to be rather power-hungry, and only the very lightest of users generally manage to get more than a day out of a battery regardless of which device they use. If you ever managed to get through two days on a single charge then you should consider yourself lucky. While a sudden change in battery life is cause for concern, the truth is that having to recharge every day is normal for most. Hell, depending on how active I am, I can drain the battery 2–3 times in a single day, and the best I’ve managed is 100% to 40% after 18 hours!