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AT&T has been quietly transitioning its 2G users to the weaker 1900MHz band from the stronger 850MHz; in an effort to boost reception quality for its 3G users. 2G users are told to upgrade at their own expense.
AT&T Improves 3G, Hurts 2G Users : Read more
AT&T Improves 3G, Hurts 2G Users : Read more