i've used it, super convenient.

you will need to have a physical suica card for that.

change region to Japan and tap your physical suica card to back of the iphone to transfer the credit to your iphone.

https://support.apple.com/en-hk/HT207155

Edit: just realised the English version of the suica app doesnt require any physical card. But then again, you will need Apple Pay to recharge the 1000 yen initial balance. So the only choice is to get a plastic card in Japan and transfer your credit to iPhone

For recharging, as Malaysia doesnt support Apple Pay, you can only recharge at the suica machine or any convenience store in Japan

Suica Eng app is just for you to create a virtual Suica and you will need to recharge an compulsory initial amount of 1000 Yen via Apple Pay to register which Malaysia doesn't support. So the only way for us is to purchase a physical plastic card, set your phone region to Japan, open up Wallet app and transfer your credit from your plastic card to Apple Pay wallet.

1. Phone region via Settings. you can actually try it now, the Wallet app will ask you whether you want to add a credit card or a Suica.
2. Switching back to Malaysia doesn't affect your usage.
3. Yes, only through machine, just tap your phone at the terminal as though your phone is a card. the only way to top up within the phone is via an Apple Pay approved credit card which is not available in Malaysia unfortunately. even in the Japanese Mobile Suica app, they only accept Japanese issued credit card.

yea your virtual Suica card will always be there and linked to your Apple ID, so you will be able to retrieve it back if you change your iPhone.

do note that after the transfer, your physical plastic card will not work anymore and become a piece of useless plastic.

and if you have an Apple Watch, the virtual Suica card can only exist on ONE device at a time.

yes 
can always swap between iphone and watch

same principle. your iPhone = card, your watch = card.

Anyone worried to go Japan in February due to Coronavirus outbreak?

Sien. My Sakura trip hotels all already booked and is those non refundable rate. Hope this wuhan thing blows over by then. Otherwise buy a few MAGA hats and wear and pretend to be ABC 😂

i going mid of March, hotel still free to cancel
but still thinking want cancel the trip or not 

Me too. In dilemma.  Going early March. Hotel allow cancel and air tickets allow to change date (with fees) but don't know change to which date.

Yes,  my hotel allow for cancellation. Taking SIA.

AA is really difficult to near impossible unless they trigger the options themselves. Otherwise ur ticket will burn or need to pay for deferment. AA is cheaper for a reason.

The surge is from the cruise all of them are quarantined

thanks  but the refund is not because of the virus right?

Me too. When is your travel date?

Coronavirus is airborne now