What exactly does it do? Reason I ask, next week I am going on a cruise. I am going to turn my phone off once I am on the boat. The last night I plan to charge my phone for use the next day once we are ported. Since you cannot charge a Droid with the power off, if I put it in Airplane mode while charging will that take care of the chance of any data coming through? I will need my phone charged after we port, as I will be sitting in an airport for nearly 10 hours.