Some Samsung mobile phones have built-in "Smart Manager" or "Memory Manager" programs, which can control the number of self-running applications, clear junk files, scan devices and find out whether there are malicious software or unauthorized system changes that threaten devices. If the mobile phone does not have a built-in "smart manager", and if you are worried that the mobile phone will be affected by unknown software from a third party, it is suggested that you can download security optimization software from Samsung App Store or other Android market software.