unifi mobile does allow no expiry BUT on the condition you need to use the data within 90 days (if i am not mistaken). Else they consider your line not active and will give notice for line termination.

You will need to request for reactivation of the same number and pay the charges.



Refer to this
https://unifi.com.my/sites/default/files/ht...Stay-Active.pdf

If there is no outgoing usage, purchase of add-ons, or reload performed
within 90 days, your line will be automatically terminated on the 91st day

Tip: outgoing usage

i see....i guess maybe its time to call their customer service

I have 3 old "bebas" lines - 2 for my kids and 1 for myself. Only top up when needed.
Usually i get the 8GB data package with 60 mins voice package.