yes we have all 3 types. not too surprisingly in terms of battery life 3G is actually the worst among the 3.
btw, I do know some devices, not iphone, on at&t network had battery issue. that's because we users buy other gsm devices and insert SIM cards from at&t, they may not be using the proper plan. as a result, they are often on a network that doesn't support long open connections.
i have personally observed that at&t network close idle tcp connection at precisely 60 seconds. this causes the push client to churn every 60 seconds. that caused excessive battery drain on those devices, and the only cure was to turn off push.
but on iphone i have not seen this behavior, since most likely at&t iphone plan makes sure the network doesn't close long idle connections for iphones.
there's actually a very simple thing to do. anyone has this issue should collect sync.log and file a support ticket. we can easily see whether there's anything unusually from the log. otherwise simply speculating on forum doesn't get us anywhere. thanks!  |