Cheap Unlocked Sprint Cell Phones on this page. Although your phone or tablet is compatible with wireless service providers, some features on your device may not work on another wireless service provider. If you purchased iPhone from an Apple Store or Verizon store, Big Red does not say that all 4G LTE devices are locked so there is no need to connect the iPhone for use with another operator. You can then use iPhone with Verizon or with a GSM carrier, but still not with another CDMA carrier due to the above-mentioned problem with flash firmware. Aio Keygen there. Back in December 2013, major US carriers set a voluntary deadline for a date when consumers would be able to unlock their phones, provided they meet certain criteria. This meant that my unlocked ATT phone only got EDGE data rates on T-Mobile, and I could not even get 3G, even taking advantage of their lively LTE service.