What system(s) is on my iPhone 4 A1332, 2G, 3G?!
AT&T Says I only have 2G capability!
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Try looking in Settings --> Cellular
This should have a switch that lets you turn on or off 3G.
If you are still having problems, go to Settings --> General --> Reset --> Reset Network Settings.
If both these do not work you may need a new SIM card from AT&T.
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