I am looking to try to get my mother a new iPhone 5s for Christmas this year. We have gone to multiple Verizon retailers and have been informed that we are not eligible for an upgrade until November of 2014 at the earliest. I understand that I can still get an iPhone for her but I would have to pay full retail. Does this mean that I can buy any iPhone 5s or do I have to buy an iPhone 5s that is GSM unlocked? Please help as Cyber Monday is nearly over and Christmas nears!