postpaid plan to sim only re-contract issue
I am currently on 24 months postpaid plan which contract is ending on early Dec, 2020. I want to change to 1 year SIM Only contract or SIM only plan.
Although I am eligible for recontract, I keep getting message of "Your existing lines(s) are not due for recontract" whenever I tried to choose and check out from starthub mobile app. It happens to both 1 year SIM only contract or SIM only plan.
Do I need to wait till last day of my current postpaid contract expiry date to change to SIM only plan?
Does the mobile service will be immediately terminated after expiry date, if I can only recontract only after contract expiry date?