Indeed, TRON would be suitable for you if your priority is Longevity and low data costs. There are downside to call costs and sms but not for your case.

Pro
- 365 days validity every top-up
- 200MB @ 3G Speed, unlimited data@throttle speed, RM10 monthly
- Daily and weekly internet available.
- whatsapp still good at the throttle speed (forget if it is 32kbps or 64kbps)

Cons
- Troublesome to get the sim pack
- Top up options limited (7-11 is the best they offer apart from online top up)
- Data Subscription Auto renews and have to disable subscription if don't intend to continue.
- No LTE.

TRON is MVNO of Digi network. Check if your area has good 3G reception for digi network.

All prepaids has their good and bad, so choose wisely.

tmgo lenovo tab plan
free 2gb x 12 month.
1 year validity ready

thanks for the info, I put the info to the first page for reference

Just bought celcom upax which the validity will last longer,then convert to magic sim plan. Upax plan validity last until the age of the user reach 25years old. My celcom magic expire in 2024.