From 1 October 2025, the UOB Preferred Platinum Visa will have two S$600 sub-caps: one for mobile contactless, and one for selected online transactions. You *could* earn more miles, but most people won't.
From now till 31 October 2025, buy unlimited miles at 1.6 to 1.8 cents each through the UOB Payment Facility. It's better than DBS's promo, but not the cheapest way of getting miles!