Well, I'll need to run some tests first, but... alright, traveling in a time vortex, just as with anything else, pressure is exerted against the thing traveling through it. Same with the Rift. So there should be some kind of physical reaction. Even if its something as small as the pressure when you take of in an plane. Felt the effects once when the Doctor, Jack and I had to use his Vortex Manipulator to make a jump.
Oh! It's brilliant. Basically the Doctor extended the range on my mobile. Can call anywhere in the universe. Which means this is not necessarily the same universe we started in. I should probably speak to him about extending it to a multi-universe plan.