Hi I am currently tethering my MacBook to my iPhone 4 ( using the personal hotspot on ios 5.1)and using my unlimited data plan from 3 network. When I tether my 3rd gen wifi only iPad to my iPhone, it connects fine but as soon as I open up safari I get a tethering block message from 3. How do 3 know that it's an iPad?, is there any settings on the iPad I can change so the network thinks its my MacBook?. Don't understand why I can tether my MacBook but not my iPad?. Please help, can't find any info on this.