Hi bcasey! Some of the phones might work. The best way to find out is to actually try to activate them. The process is simple:
You can also dial *228 from one of the Alltel phones. When prompted by the automatic system, input the mobile number and the last four of the SSN or billing account password as set by the Account Owner. In either case, make sure that the mobile number you're using is not in service at the time you do it!