Used Cell Phones For Sale How To Do I Activate A Used Cell Onto My Plan And Onto My Cell Number?

How to do I activate a used cell onto my plan and onto my cell number? - used cell phones for sale

I have a softphone on the parking lot the other day. I wanted to turn to when they are used in my mobile number and my career, but also to keep my old phone, so I have two in hand. The service with the phone I found was different from mine, how do I change twice?