HTC X310E Titan Unlocked Smartphone with Windows Phone OS 7.5, 8 MP Camera, 16 GB Internal Storage, Touchscreen, Wi-Fi, GPS--No Warranty (Carbon Gray) Unlocked cell phones are compatible with GSM carriers such as AT&T and T-Mobile, but are not compatible with CDMA carriers such as Verizon and Sprint. Network: Quad-band GSM/GPRS/EDGE:850/900/1800/1900 MHz. HSPA/WCDMA: Europe/Asia: 850/900/2100 MHz Platform: Windows Phone OS 7.5. CPU Processing Speed: 1.5 GHz. Total storage 16 GB. Available storage: up to 12.63 GB. RAM: 512 MB. Camera: 8 megapixel camera with F2.2 lens, dual LED flash, and BSI sensor (for better low-light captures). Front camera: 1.3 megapixel front camera. 720p HD video recording Connectors: 3.5 mm stereo audio jack, micro-USB 2.0 (5-pin) port. Bluetooth 2.1, A2DP for wireless stereo headsets, PBAP for phonebook access from the car kit. Other supported profiles: AVRCP, HFP, HSP. Internal GPS antenna Power & Battery: Rechargeable Lithium-ion battery Capacity: 1600 mAh, Talk time: WCDMA: Up to 410 minutes, GSM: Up to 710 minutes.