The Cingular network frequently has areas of great reception with the 850 Mhz band.
Unfortunately, the 7210 does not have the 850 Mhz frequency channel, so it has to revert to the lower-reception 1900 Mhz band.
Sell the 7210 and get a 7280 or 7290 (or better yet, 8700), and you'll get the same number of bars as your old phone.
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