Lenovo a3000 = rm639
Quad core1.2ghz, dual sim support.
Hspa+,edge,gsm.
7.0 inch
Whatsapp,tubemate,line,viber,kakao talk no problem at all.
Battery 4400mah quite ok for heavy usage for the whole day.
No lagging so far,because not interested in heavy game.
Camera 5.0 megapixel and 0.3 megapixel. No flash for camera.
Screen quality not so good but ok only.