Its an old code used for nokia to switch from enhanced full rate to half rate. Half rate uses marginaly less power because there is less data to encode into the GSM timeslot, and less data to process to generate the FER. You still use one timeslot so there's no RF power reduction.
Bottom line, it wont do anything on the BB. It may be a geniune mix up somewhere along the line because the code exists for nokia, but most likely its just a something someone made up to look clever.
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