A number of people have reported losing data over AT&T when upgrading older iPhones to iOS 4. The culprit isn’t clear, though many owners reported jailbreaking their iPhones in the past, though this doesn’t appear to be a universal factor. Regardless, the common solution for getting data back is to restore the iPhone from a previous state, sometimes using a different admin account on an OS X system in order to force iTunes into re-downloading the iOS 4 update.
We underwent the same loss of data after upgrading our 3GS, and though a restore worked after setting the iPhone up as a new phone, we weren’t happy with losing all our data. (Restoring from a previous backup didn’t work, even after restoring the firmware and setting the iPhone up as a new device.) Fortunately, we found a solution that worked, which doesn’t require one to restore the iPhone at all.
It seems that the loss of data may be tied to AT&T’s carrier file, which may have ben corrupted/changed on older iPhones (possibly after jailbreaking or installing jailbreak apps). To fix this, get on a wifi network, and from the iPhone, head over to HELP.BENM.AT and follow the links to obtain the carrier file for your respective service provider. Once the file has been installed, you’ll be back up and running with cellular data, without having spent the time to set up your iPhone as a brand new device.
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