I use my existing iPhone 4 while cycling as my GPS and cycling computer. I have a bike mount specifically for the form factor of the iPhone 4.
I am looking at upgrading to a larger iPhone 5S this fall, but I would like to be able to continue to use my iPhone 4 for cycling. Both devices would be Verizon provided.
Is it possible/feasible to repeatedly switch the device assigned to my service plan to the iPhone 4 while cycling and then back to a iPhone 5S otherwise? How long does it take for the service to be reassigned to the other device? If I do this a lot, is there a fee for doing so, or a limit to the number of times that an account is allowed to be reassigned?