I was purchased my samsung z2 in last year it has 1 giga bite ram and 8 giga bite internal it has 4 inches screen when I purchased this mobile it was running well but after few days when I installed new and more apps its was starting hanging this phone has big problem is that it was tizen mobile it operating system is tizen no android app was running in this phone when I sen a android app in this mobile by bluetooth it is can not running because it was tizen mobile it was its biggest dissadvantage it las I can say that it was time wasting an money wasting.