LG Optimus L90 D415 8GB Unlocked GSM Quad-Core Android Smartphone - Graphite Gray This cell phones are fully compatible with T-Mobile. For GSM carriers Like AT&T as well as GSM carrier that they need SIM cards (e.g. H20, Straight Talk, and select prepaid carriers)need to contact the service provider to check fully compatibility of t2G: GSM 850 / 900 / 1800 / 1900, 3G: 850 /1700 / 1900 / 2100 (Bands 2, 4, 5) 4.7-inch IPS LCD Multi-Touchscreen w/ Protective Corning Gorilla Glass 2 and LG Optimus 3.0 UI Android v4.4.2 KitKat (upgradable), Quad-Core 1.2 GHz Cortex-A7 Processor, Chipset: Qualcomm MSM8226 Snapdragon 4, Adreno 305 Graphics 5 Megapixel Camera w/ Autofocus & LED Flash + Front-Facing VGA Camera- Internal Memory: 8GB, 1GB RAM + microSD Slot Expandable up to 32GB