Good morning. I currently have an iphone 6 with verizon under contract. I was told the phone is unlocked directly from a verizon rep. However I found someone who is willing to trade me his 6+ that is on AT&T for mine but he told me it will not work on verizon, is this true? Im basically looking to trade my verizon 6 for a 6+ but im unsure what to look for. Thanks so much