You cannot buy Suica outside of the greater Tokyo area. in Osaka, you have to buy ICOCA. When you leave the Kansai (Osaka/Kyoto) return your ICOCA and buy Suica when you get to Tokyo.
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Travellers flying in from Narita or Haneda International Airport can purchase a Suica card easily at JR East Travel Service Centers. You can also buy a prepaid Suica card from ticketing machines at major JR East train stations and JR Ticket Offices (Midori-no-madoguchi).
The JR pass is only worth it if you travel through different cities, if you are just travelling to Tokyo to Kyoto for example, I would just pay on the Suica. You can do the online calculator or just use google to calculate which trip is easier - paying individually on Suica or getting a JR Pass.
The Suica card can be used in the majority of Japanese public transport: subways, buses and all local trains, as well as in buses and taxis displaying the Suica logo. Please note that the Suica card does not work on express trains, shinkansen, highway buses or airport shuttles.
No visitor to Tokyo should be without a Suica card and no visitor to Japan should be without a JR Pass. The Suica card is convenient for intercity trains and buses while the JR Pass saves you time and money when traveling through the country.
Each person needs one. Pasmo/Suica is read when touching the IC card reader upon entering and exiting a gate, and the correct fare is deducted from the card. The same card cannot be read entering twice at the same station. Thank you for the quick response.
Will a Suica card save me money over regular train tickets? Yes, but only a very little at a time. Within Tokyo, the fare for Suica (or any IC card) users is a couple of yen cheaper than the full fare price.
Suica cards are managed by JR East, while Pasmo cards are managed by non-JR Lines, including Tokyo Metro and Keikyu Electric Railway. However both cards can be used on train lines run by other operators, e.g. you can use you Suica on a Tokyo Metro Line or your Pasmo on a JR Line without issue.
The best way to travel between Tokyo and Osaka is the shinkansen (bullet train). The fastest type of shinkansen, which is called the Nozomi, takes around 2 hours and 30 minutes and costs Y13,620 for a one-way trip in an unreserved seat.
The Suica/Pasmo reader and ledger tracking your expenses.* Nice for travelers: The app, as well as all the station information, is available in Japanese and English.