My wifes unlocked (by AT&T in June) iPhone 4 drops back to E. I can turn on airplane mode, wait a few second. Turn airplane mode off and I get 3G. Some times we have enough time to run speedtest and get fairly good speeds. 3 megs down etc. but then it will drop to E and we get like .06 megs down. 3G will never last more than a minute. We were told that it will work "and it does for several seconds", but this isn't useful at all. My wife is starting to regret switching over.
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