Question

when my mob is hang then what can I do

Answer 1

clear storage of u r phone has much u can
or else if virus is present use antivirus
thank u

Answer 2

Thanks for asking this question let me tell you some solution for this 
Firstly if you want that your mobile is not hang again you have to reduce workload on mobile i.e. you have to reduce apps from your smartphone if you have more application your mobile will hang because of apps takes ram space.You have to updated all the apps.Switch the mobile and remove battery.Install all of your apps in external memory (SD card) thus you have to move all apps from internal memory to external sd card.Delete unused apps or video images etc.Install antivirus software, other wise mobile have virus due to unnecessary resources e.g. due to internet or any corrupt data. 

I hope all these step will guide you :)