Omnicorp wrote: I am wondering if I can transfer her number to a competing service (maybe the one with the motorcycle woman) and change my plan to one phone only.

Absolutely, simply go to the other provider and let them know you would like to port one of your numbers. They will initiate the port and when completed, you will only have 1 Verizon line. If the line you port is under contract, you will be responsible for the Early Termination Fee.