I have iphone 5 with 4G (Telstra) and the connection speed is reasonably fast. When you have connection speed through your phone I just can't understand why you want to pay for an additional device. Anyway, tethering not possible with ipads, which I think is the most commonly used portable device, it is a waste of time and money. I am happy with the connection speed of 4G. Even the BMW apps and internet/google are much faster loading through 4G. Why do you have to take out a second broadband plan when you're already paying for one part of the phone package.