Update for sharing:
Went down on Sunday to a eight retailer which turned out to be a provision shop at one of the MRT/LRT station. Only 1 man handling everything, while waiting for him to log in to his eight account, stood there to watch him multi-tasked selling cigarette, newspaper, water and other mobile top up
No singpass was used, only scan IC front and back. No email received, no number given. Asked to pay $8 and to put in SIM card to call out if want to know temporary number, and port-in will be done within 2 days.
Put in sim card, received welcome SMS, used it to call out to get the temporary number to log in to eight account to check. Double Eight plan active and the wallet has the extra $8 credited.
Number ported over successfully on Tuesday, but no SMS was received.