iOS 5.1 magically adds 4G to your AT&T iPhone | iMore.
All they’ve done, as has been done for some Android phones, is change the text “3G” to “4G” even though it still runs only on the older technology.
Update: It may be indicating 4G for the AT&T HSDPA+ connections only rather than the 3G connections. HSDPA+ is sort of a 3.5G technology that T-Mobile began using a couple of years ago.
However, look what AT&T said about T-Mobile’s HSPA+ 4G network just a few months ago – it’s just HSPA+, not real 4G.
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