HTC One M7 32GB Unlocked GSM 4G LTE Android Cell Phone - Silver Display: 4.7-inches, Resolution: 1080 x 1920 pixels Camera: 4 MP, f/2.0, 28mm, autofocus, OIS, LED flash Processor: Quad-core 1.7 GHz OS: Android 4.2 (Jelly Bean) Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20 and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.