Which data plan has the longest validity? Most data plans i found are monthly plans that are cheap but far exceed passive minimal requirement. The most suitable plan i found is Unifi Mobile which validity based on usage (including data) thus it is very cheap to maintain validity (few cents per month?) So, anyone can share more?

Thanks for replying.

The plan is dirt cheap but it is still monthly plan. I should have asked for data pass instead of data plan. So, any data pass with very long validity? One example is the now discontinued Hotlink Tablet Plan that offer 1GB for 1 year at RM30.

Thanks for replying.
But it doesnt suit me because i mostly cannot finish 1GB in a month.

tldr: cheap data with long validity

I already have a mainline (unifi prepaid) which i dont want to switch to other telco. It is good but its data plan is not that cheap for me (RM12.50 for 1GB) because my phone cannot connected to 4G/LTE. So, i am looking for cheap data plan but with long (and cheap) validity and i am using data only during working days, 1GB daily is enough.