Yeah, it's the Osaifu-Keitai. Apple has it enabled for all phones on the market, while Android phone manufacturers avoid adding it to theirs outside Japan because they would have to pay fees to Sony for it. The funny part is that Sony itself doesn't enable it for phones outside Japan, even though FeliCa is a subsidiary of Sony :D Another funny bit is that some phones, like the Pixel, are capable of running it on phones made for other markets. Some users were able to force the Osaifu-Keitai app to think the phone was made in Japan, and that was all it took to enable it (although you'd have to root your phone + the manufacturer should have released their phones in Japan, to ensure the chip is capable). So, yeah, although a few years ago it might have been a specific chip being needed in the phone, nowadays it's mostly software that doesn't allow you to use the one you have while in Japan.

All in all, PASMO/Suica/etc is basically a very limited debit card company haha. I guess Japanese people enjoy using it mainly because it puts a cap on how much they can spend (iirc, about 100 euros allowed at once on the card). Japan is a highly consumerist society, so this format was probably adopted (instead of credit/debit cards) mainly to combat it somewhat :D

That's nice. How does it work if you have a transportation subscription, like paying once a month?