I had asked Singtel via whatapps chat and the reply is eligible customers with compatible 5G handset will receive an sms to enrol them into the 5G trial.
The ball is always on their court. Not sure how are they going to allocate it fairly.... Finger crossed.
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I also asked Singtel via Whatsapp. The CSO replied, mentioning that "Existing Singtel Combo 1, 2, 3, 6, 12 or XO 48, 78, 108 customers will be able to enjoy 5G Now trial from 9 September 2020 in a progressive manner. Customers must have recontracted with a 5G device offered by Singtel. Eligible handsets include: Huawei P40 5G series, Samsung Galaxy S20 Ultra 5G, Samsung Galaxy Note20 5G, Samsung Galaxy Note20 Ultra 5G, Oppo Find X2 Pro 5G, Huawei Nova 7 SE 5G." This information is accurate for customers who recontracted or signed up before 1 Sep 2020.
For customers who recontract or sign-up after 1 Sep 2020, 5G VAS will be auto provisioned upon sign-up or recontact.
Order of priority for the first 10000 customers will be (likely) based on: price of plan, and then date of sign-up or recontract.