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Re:Apple Plans iPhone for Japan With Tap-to-Pay for Subways by dcw303 on Thursday August 25, 2016 @09:24PM (#12363742)
I don't know. Here's a page that shows Suica support for JR; I have no idea if the subway companies use the same. I would generally think it would be Japanese handset manufacturers, so Sony, Sharp, etc.

https://www.jreast.co.jp/mobilesuica/whats/models.html

Re:Apple Plans iPhone for Japan With Tap-to-Pay for Subways by veidr on Thursday August 25, 2016 @10:30PM (#12363954)
IC cards for trains had a grand unification a few years back; Suica used to work only on JR but now works on subway etc. (Progress FTW!)
Re:Apple Plans iPhone for Japan With Tap-to-Pay for Subways by aninhumer on Friday August 26, 2016 @04:37AM (#12364988)
Suica is compatible with almost everything else.

Japanese IC card compatibility diagram: https://commons.wikimedia.org/wiki/File:ICCard_Connection_en...