Samsung Galaxy Ace Duos

Key Features :
•    Dual-SIM, calls received on both cards, simultaneous calls and data
•    Quad-Band GSM (both SIMs) and dual-band 3G support (only one SIM at a time)
•    7.2 Mbps HSDPA
•    3.5" 256K-color HVGA TFT touchscreen
•    ARMv6 832MHz processor, 512MB RAM
•    Android OS v2.3 (Gingerbread) with TouchWiz v3.0 UI
•    3GB internal storage, hot-swappable MicroSD slot
•    5 MP auto-focus camera with VGA videos @ 30fps
•    GPS receiver with A-GPS
•    Stereo FM radio with RDS
•    3.5mm audio jack
•    Document editor
•    Accelerometer and proximity sensor
•    Swype text input
•    MicroUSB v2.0
•    Stereo Bluetooth 3.0
•    Good audio quality

Main disadvantages
•    Sub-par ARMv6 CPU limits performance and choice of apps
•    Mediocre display
•    No hardware shutter key, no flash
•    No secondary video-call camera
•    No HD video recording
•    Abysmal video codec support