I had a glitch with activation this morning at the Apple Store. I chose to do setup by direct transfer from the old iPhone to the new iPhone. At one step (don't remember which) the old phone stopped recognizing that it was being asked to transfer data to the new phone. I tried a three button restart (up vol/down vol/right side button) and it got happily back to work.
Another person at the same table had the same problem and this worked for her also. FWIW, YMMV, etc.
Another person at the same table had the same problem and this worked for her also. FWIW, YMMV, etc.