Moderator, El Al and Marriott Bonvoy, FlyerTalk Evangelist
Join Date: Feb 2005
Location: SIN
Programs: SQ*G, Mar LTT, Hyatt Glb, AA LTG, LY, HH, IC, BA, DL, UA SLV
Posts: 12,018
I have an iPhone 8 which isn't from Japan. Was able to use the Suica app and add the Suica to my Apple Watch S3. What I noticed using it this past week is that it is kinda annoying for the trains as the suica reader is on the right and I wear the hand on my left wrist.
There also doesn't seem to be a way to top it up using the machines.