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If you're in an area where there's no cell phone signal, it can cause both your Nook and cell phone to keep looking for a signal and excessively drain the battery because the radio circuitry uses a lot of power. Unless you are shopping, using the web browser, or looking at the B&N Daily, you might as well switch your Nook to airplane mode. It saves on the battery because the wifi and cell-phone are both turned off.
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