While my iPhone is connected to my MBP and internet tethering is on, the blue line at the top indicating tethering is showing. Some apps do NOT cater for this reduction in usable area. One example is Ping!, where the text entry field is at the bottom of the screen. With internet tethering enabled, I cannot access the text field of Ping!, so I cannot type any messages unless I rotate the phone and use Ping! in landscape mode. I am used to the portrait layout of the iPhone keyboard, so it is a bit of a nuisance. Is there no way one can disable the blue "internet tethering" line? No, my iPhone is not hacked and I don't intend to do so ...