Lenovo A1900 spotted online at alibaba, which goes on sell in China for about 50 USD.
The A1900 comes with 512MB of RAM and boasts 4GB of internal storage, supports up to 32GB external microSD card. The phone features a 4-inch IPS capacitive screen with 800 x 480 pixels of resolution. Connectivity options include FM Radio, 3.5mm ear-jack, Bluetooth, micro-USB, WiFi, 3G and GPS.
The Lenovo A1900 houses a 2-megapixel rear camera, features Gravity Sensor. It measures 121 x 62 x 9.5mm/4.75 x 2.95 x 0.37 inch and weights is 117 gms with 1500mAH Li-ion battery.