Multi-user option not avilable in Android one after Lollipop update I have Karbonn Android one phone. It is updated to Lollipop 5.1. I read that multi-user option is available in Lollipop. But in Settings the Users option is not available. 

How can I enable it? Is it not supported by Android one phones?
It is supported, but you must have rooted device. 

Download file manager that allows root access(for example: ES File Explorer)

Navigate to /system/

Backup build.prop

Add these lines at the end of build.prop file: 

fw.show_multiuserui=1

fw.max_users=5

Save and reboot device

If something went wrong, restore build.prop backuped version from recovery.