The Lumia 520 from Nokia was first released in 2013
(Versions: Nokia Lumia 521 RM-917 (T-Mobile))
Model ID:
Qualcomm MSM8227
Dual-core 1.0 GHz with 8GB 512MB RAM
OS: Microsoft Windows Phone 8, upgradable to 8.1
Display: 4.0 inches, 480 x 800 pixels
Rear Camera: 5 MP

Front Camera:

Battery: Li-Ion 1430 mAh, removable (BL-5J)
Talk Time: Up to 14 h 40 min (2G) / Up to 9 h 40 min (3G)
Network: GSM / HSPA
HSPA 21.1/5.76 Mbps
Wi-Fi 802.11 b/g/n, hotspot
Color Options: Yellow, red, cyan, white/black