Originally Posted by
der_saeufer
Prices are in HKD, so the 30 day plan with 10GB for US/CA/UK etc. or 3GB "worldwide" is ~18 USD.
You should be able to install the Red Pocket eSIM and pay for service before you leave but it likely won't fully activate until you can hit a network where it has service. Worst case you'll need to access wifi while in the U.S. but that shouldn't be hard to do on arrival at the airport.
Did you buy a 3HK SIM? I'm thinking of buying a physical one when I get back to HK later this year.