Hello, I upgraded to the latest 3.1 firmware and noticed there is a new section in Usage that shows Tethering Data. I do not use my phone to tether data, but sometimes when viewing the usage it'll say 1.0KB Recevied, nothing ever for Sent, always 0 bytes. Is this something I should be worried about? I read on Apple Support to turn off Internet Tethering, go to General > Network > Internet Tethering, but there is no such option. Is this something I will be charged for? the 1.0KB?