Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile; also compatible with GSM SIM cards like H20 and select prepaid carriers. Phone will not work with Sprint, Verizon, Boost Mobile, Virgin Wireless or other CDMA carriers. Please contact your carrier to confirm support of voice and data on this unlocked GSM device. Service Provider: T-Mobile, Unlocked. Phone Type: Smartphone. Operating System: Android OS. Calling Features: Phonebook, Call Waiting. Telecommunication Features: Voice Mail, Music/Audio Playback, Speakerphone, Alarm Clock , Calculator, Calendar, Caller ID. Display Features: Voicemail Indicator, Clock, Date and Time, Color Display, Signal Strength Indicator, Missed Call Indicator, Battery Level Indicator. Talk Time: Up to 18 hours. Standby Time: Up to 370 hours. Screen Size: 5.0 " Maximum Resolution: 1920 x 1080. Built-In Digital Camera : Rear and Front-Facing Camera. Megapixels: 13.0 Megapixels. Video Calling Capability: Wi-Fi and 4G. Video Resolution: 720p. GPS Enabled: Yes. Built-In Memory Storage Capacity: 16GB. Media Type Compatibility: MicroSD Card. Wired Connectivity: USB, Wireless. Wireless Frequency/Band: 850/900/1800/1900 MHz. Wireless Technology: GSM. Wireless Standard: IEEE 802.11a/b/g/n/ac. File Formats Supported: MP3, WMV, WAV. Input Method: Touchscreen, Virtual QWERTY Keyboard. Battery Cell Type: Lithium-ion. Protective Qualities: Scratch-resistant. Includes: Data Cable, Battery Charger. Battery Required, included: 1 lithium ion non-universal. Assembly Details: no assembly required.