ZTE Avail II Z992 Unlocked GSM Android 4.1 Touchscreen Smartphone - Black Android v4.1 OS Qualcomm Snapdragon S1 MSM7225A chipset; 1000 MHz, ARM Cortex-A5 processor 3.5" Touchscreen Display, 2 Megapixel Camera Facebook, YouTube (upload), Picasa/Google+, Twitter 512MB RAM, 4GB Internal + microSD Slot expandable up to 32GB Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.