Xperia M2 another great deivice from Sony no doubt. it has 4.8 screen quite enough for playing games and watching videos. it have dual stand by sim which mean you can use second even u on call in second sim. Connetivity is 3g+GSM no 4g /LTE in this device
Great thing is its has 8mp back camera support 1080p video recording. its have Front VGA camera that gives only 480p recording which mean Megapixels are low. if you looking for selfie from this phone I probably say dont buy this . its light weight device 1.13 W/kg(body) only .
If we talk about android os xperia m2 is come with android 4.3 and sony focus on this device much sony upgrade it to kitkat and then Lolipop(5.1.1) but I think its final update for it no Android 6.0 On M2 dual and single sim mobile
Lets see quick summary of this device
Advantage:
# Large Screen
# Slick-looking design
# Impressive Battery Life
# Lightweight Devices
# Fast Processor, No Lagging
Cons:
# Overzealous photo sharpening
# Average Speaker Quality
# Body scratches easily
I gave 7.5/10 for Xperia M2 Dual