to those looking to port over to Zero1, i would advise you NOT to.
1 month ago, i was looking for a cheaper plan for my dad and i proceed to sign up on their website. Had I done my homework earlier, i wouldn't be stuck in this **** now.
Emailed them immediately when i had issue but only got an reply 3 weeks later. Super difficult to terminate and as you see what others have wrote, since they are holding your credit card details, frequent charges often billed to the credit card for no reason. Holy ****!
while service is almost non existent, it's still the cheapest plan with real unlimited data, just have to take some precaution
use singtel dash as payment. every month top up $9.90. so far no problem for me and don't have to worry if terminate since i won't leave any money inside