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Cell phone chip maker RF Micro Devices (RFMD) was up 19.8% at midday, continuing its climb from Wednesday on news that product orders from Nokia (NOK) would be higher than anticipated. This morning, Wit SoundView upgraded the stock to strong buy.

RF Micro closed Wednesday near its intraday high of 13.95 and quickly rose to a high of 17 this morning on heavy volume. The company posts quarterly results April 17.