Switching Service Between Two Different Phones.

If the two phones use the same SIM. (Same size) odds are you can swap them. You can do this or Verizon may do it.

Second thought.

As I recall the Jitterbug phone is somewhat limited in what it can do... You may be able to get a lower cost plan if using it. That one I can not answer however, only ask.. I do not support Verizon due to past experience with what THEY call customer Service and I call Cuss Some More Non Service.