there's a catch for this YES prepaid.
u need active plan + active line.
active plan is easy, just purchase the RM10 plan in app.
but to maintain line active, it's 2 days for every RM1 top up.
meaning, u thought u just need fo top up RM10, buy the 20GB plan for 1 month.
but RM10 only gave u 20 days of validity. once your line inactive, even if your plan is active u also cannot use.
so in the end, u'll need to RM15.

but there's another "but"!
there is no option to top up RM15, the exact 30 validity days that match your plan.
got top up option for RM 5, 10, 30, 50, 100.
if u top up RM 10, then 5 (or vice versa), u'll only get 20 days validity, cuz the it overlaps.
so u need to top up RM10, theb 20 days later, another RM5.
it's a hassle.

so technically, u'll end up spending RM15 instead of RM10.
u thought the extra RM5, u can purchase other things, like celcomdigi or hotlink prepaid, u can use your credit to buy in app vouchers.
but YES store literally has ntgh, so u'll probably spend the extra credit purchasing data, call time, or sms bundle.
u can transfer to ither YES users, but good luck finding other YES users.

& the biggest downside is, YES coverage is still shit till this day, especially if indoor, mall underground.
5G coverage mostly same, cuz DNB, but their 4G is slower than other telco.

plan validity & line validity is 2 different thing.
plan may active for 30 days, but u need to keep your line active to use the plan also.
line is kept active by topping up credit.