Digi Super Long Life 365 for RM38 work the same way. Every year at the end of the validity period, I will top up around RM50 and this will extend the validity period by nearly 2 months or so. Further wait for the end of the renewed validity period before applying the Super Long Life package.

To ensure that I remember to do all this, I create reminders in my Google calendar to alert me. Easy to forget as this need to be done once a year and the exact date keep moving.

Me currently use this ...
If want cheaper, rm3 permonth,30 sms

din't try other .... but number just for parking, u can do RM 3 * 12 to rm3 * 6, yoodo pay one month n rest for one month.
but yoodo system is suck, they won't alert when it reach expired or anything.