This is a Windows 8.1 Phone. It has been unlocked, wiped, and reset to Factory Defaults.   Check Microsoft for support. No warrranty. 

NOT included:
-SD card
-SIM card
-Headphones/Earphones
-Instruction Manual
-Original Box
-Charger

Included:
-Phone
-Battery (Original)
-Case
-Charge Cord

Specifications:

Also known as Nokia Lumia 830 RM-984


Also known as Nokia Lumia 830 RM-984

NETWORKTechnologyGSM / HSPA / LTE
2G bandsGSM 850 / 900 / 1800 / 1900
3G bandsHSDPA 850 / 900 / 1900 / 2100
4G bands1, 3, 7, 8, 20
 2, 4, 5, 17 - AT&T
SpeedHSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps
LAUNCHAnnounced2014, September. Released 2014, September
StatusDiscontinued
BODYDimensions139.4 x 70.7 x 8.5 mm (5.49 x 2.78 x 0.33 in)
Weight150 g (5.29 oz)
SIMNano-SIM
DISPLAYTypeIPS LCD
Size5.0 inches, 68.9 cm2 (~69.9% screen-to-body ratio)
Resolution720 x 1280 pixels, 16:9 ratio (~294 ppi density)
ProtectionCorning Gorilla Glass 3
 ClearBlack display
PLATFORMOSMicrosoft Windows Phone 8.1, upgradable to Microsoft Windows 10
ChipsetQualcomm Snapdragon 400 (28 nm)
CPUQuad-core 1.2 GHz Cortex-A7
GPUAdreno 305
MEMORYCard slotmicroSDXC (dedicated slot)
Internal16GB 1GB RAM
 eMMC 4.5
MAIN CAMERASingle10 MP, f/2.2, 26mm (wide), 1/3.4", AF, OIS
FeaturesZeiss optics, LED flash, panorama
Video1080p@30fps, stereo sound rec.
SELFIE CAMERASingle0.9 MP
Video720p
SOUNDLoudspeakerYes
3.5mm jackYes
COMMSWLANWi-Fi 802.11 a/b/g/n, dual-band, DLNA, hotspot
Bluetooth4.0, A2DP, EDR, LE, aptX
PositioningGPS, GLONASS, BDS
NFCYes
RadioFM radio
USBmicroUSB 2.0
FEATURESSensorsAccelerometer, gyro, proximity, compass
BATTERYTypeLi-Ion 2200 mAh, removable (BV-L4A)
ChargingWireless (Qi)
Stand-byUp to 528 h
Talk timeUp to 12 h 54 min (2G) / Up to 14 h 48 min (3G)
Music playUp to 78 h
MISCColorblack, 
SAR0.87 W/kg (head)     0.83 W/kg (body)    
SAR EU0.46 W/kg (head)     0.59 W/kg (body)    
Price when newAbout 330 EUR
TESTSDisplayContrast ratio: 1078 (nominal), 1887 (sunlight)
CameraPhoto / Video
LoudspeakerVoice 65dB / Noise 66dB / Ring 78dB
Audio qualityNoise -89.7dB / Crosstalk -91.6dB
Battery life