Nokia Lumia 520 GSM Unlock 3G Phone, 4-Inch Touch Screen, 5MP 720P Camera, Windows Phone - Black (International Version) 2G: GSM 850 / 900 / 1800 / 1900, 3G: WCDMA 900 / 2100 4-inch IPS LCD Capacitive Multi-Touchscreen w/ Scratch-Resistant Glass Microsoft Windows 8 (upgradeable to WP8 Black), Dual-Core 1 GHz Processor, Chipset: Qualcomm MSM8227 5 Megapixel Camera (2592 x 1936 pixels) w/ Autofocus, 1/4'' Sensor Size, Geo-Tagging + Video Internal Memory: 8GB, 512 MB RAM + microSD Slot Expandable up to 64GB Unlocked cell phones are compatible with GSM carriers but are not compatible with CDMA Carriers. This cell phone may not include a US warranty as some manufacturers do not honor warranties for international version phones. Please contact the seller for specific warranty information.