First and foremost, you need a phone with eSIM tech to get this roaming SIM.
* iPhone XR/XS
* iPad LTE^
* Google Pixel 2 or 3^
^These devices have eSIM, not entirely sure if they work with Three's offering.
Essentially, you scan a QR code on your screen and you "have" the eSIM. There are no int'l delivery charges because all you need is said QR code. It should be an instant process
10-Day roaming day pass has no limit in data usage. Lower as $13.8/day. Online is Free and Fun!
10-Day China, Macau, Taiwan, Japan, South Korea, Singapore, Malaysia, Thailand, Philippines, Vietnam, Australia, USA, Canada, United Kingdom, Italy, Sweden, Ireland, Denmark, Austria, France $138 [HKD]
I hope this helps someone. I personally haven't tested this roaming eSIM as I have a Nokia 8. Apologies in advance if I misunderstood the dodgy English in the 3 HK page.
Can anyone confirm this can be activated without being in Hong Kong?
The site says "Recommend to activate the eSIM in HK and please ensure the mobile data is active in your device when you are activating the eSIM"