Polytron
Polytron Zap 5

Advan
Advan Vandroid S4M

Features
Android OS, v4.2.2 (Jelly Bean), Yes, Dual-core 1.2 GHz, Yes, Yes, SMS (threaded view), MMS, Email, Push Email, IM
Android OS, v4.4.4 (KitKat), Yes, Yes, Qualcomm MSM8916 Snapdragon 410 Quad-core 1.2 GHz Cortex-A53, Yes, Yes, SMS (threaded view), MMS, Email, Push Mail, IM
Android OS v4.4 (KitKat), Yes, Single Core 1.0 GHz, Yes, Yes, SMS (threaded view), MMS, Email, Push Email, IM
Memory
Micro SD, up to 32 GB, 4 GB storage, 512 MB RAM
Micro SD, up to 32 GB, 1 GB RAM, 8 GB internal memory
Micro SD, up to 32 GB, 4 GB storage, 512 MB RAM
Display
TFT capacitive touchscreen, 480 x 800 pixels, 4.0 inches, 16 M colors
TFT capacitive touchscreen, 480 x 854 pixels, 4.5 inches (~218 ppi pixel density), 16 M colors
TFT capacitive touchscreen, 480 x 800 pixels, 4.0 inches, 16 M colors