The two SIM cards have both standard size. Unfortunately, 3G is only possible via SIM1. Sim 2 can only 2G but that's not so bad.
The back and the edge of the device are made of totally insensitive materials (back part made of Kevlar carbon-look and edge out fairly scratch-resistant plastic)
The display is bright enough and has ne sufficiently good resolution.
The battery lasts loose by even two days.
The voice quality is also good, without any noise in both directions.
GPS reception is very quick and very tidy.
Wi-fi works very fast and has NEN very good reception.
The camera takes good pictures if it is bright enough, but sometimes you have to tap the screen by itself focus thus created sharp images. In the dark, it is also ok, even if the quality of course wears off, the camera with LED flash is to use good anyway.
The Frontcam with 5MP naturally makes much better pictures than other phones with 2MP or less. Since Selfies are finally time useful and not totally pixelated.
The speaker is also loud enough and sufficient, depending on the ambient noise, also known as loose speakerphone.
With WiFi and USB OTG directly even the most important additional connectivity alongside Bluetooth 4.0 here.
All in one, a super-effective, successful, cell phone in Slim format, with insensitive surfaces, would highly recommend it for anyone looking for a dual SIM smartphone with reasonable facilities.