Yes , FAQ mention you need buy add-on for hotspot
https://www.hotlink.com.my/en/support/plans...imited/general/

But i wondering, can we buy add-on and set when to use it ?
Example
- buy 5GB addon ( 1week )

Use for hotspot , maybe used 3GB, remain 2GB

I believe later when we continue any usage,it will draw from add-on first.
(or they will give option to use add-on or not)