* Backflip to sell for $99.99 at AT&T March 7 Stocks * Motorola shares had closed at $7.11 on NYSE NEW YORK, Feb 18 (Reuters) – AT&T Inc (T.N), the second-biggest U.S. mobile service, plans on March 7 to start selling the Motorola Inc (MOT.N) Backflip, the operator’s first phone based on Google Inc’s (GOOG.O)
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