Groupon offers Refurbished models of the Apple iPhone 6 or 6 Plus 16GB, 64GB, or 128GB Smartphone (GSM Unlocked) from just $279.99. Free Shipping & Free Returns will be included in your order. Both the 6 and 6 Plus have a Retina HD display allowing you to watch your media in amazing detail. They've also got powerful A8 processors, and 4G LTE capability. While these phones are labeled GSM unlocked, they are not compatible with Sprint or Verizon.