I bought a used Samsung for grandson. When I went to activate on an existing line, Verizon said I needed a new Sim card. Went to Verizon corporate store to get a new sim card. I was told that since the phone was a prepaid phone (which I didn't know when I bought it) I would have to pay for a prepaid card for 6 months before activating. Very upset that I couldn't activate the phone.