Yes, that's roughly like paying RM2 a month for a year, not bad. Data balance doesn't expire so you can continue to slowly use it (smallest/minimum block to use is 500MB) if you need to.

I initially took up the 28 months validity promo (along with 10GB data) which will end Feb 2024 and currently still have 6GB data balance. So after that I just need to extend it for a year @ RM25 without needing to get any additional data, I only pay for more data when the balance eventually runs out as I slowly from time to time use it as needed.

I don't think it's too costly way to keep the number, only problem with OneXOX is the line isn't that great, but with no contract required just need to find the best post paid offer to jump out OneXOX for my other line.

I didn't see that 36 months extra, I will have to check again. But that's pretty nice for 5 years. So far I haven't top up at all since the first time I bought it and paid for the 10 GB plan. I turn off the auto deduct thing, I prefer to do it manually since I hardly use it. How much data does the car GPS use in a month? More than 500MB?