If you find yourself arriving to Tokyo – maybe via the Haneda airport – and having bought a Japanese prepaid SIM card – Pocket SIM – at the airport which you cannot get working, maybe this will help.
The included pamplet says to use the following settings (so maybe Google led you here?)
Name | ppsim |
APN | ppsim.jp |
User name | pp@sim |
Password | jpn |
Authentication type | PAP or CHAP |
but they won’t work.
The actual settings can be found in this Twitter thread. Try the following (Pocket SIM Premium)
APN | ppsim.jp |
User name | pp@psim |
Password | jpn |
or (Pocket SIM)
APN | psim.jp |
User name | japan@psim |
PAssword | japan |
or
APN | dm.jplat.net |
Username | pocket@sim |
Password | japan |




P.S. If you haven’t bought the SIM card already, I recommend that you try to find the U-Mobile prepaid SIM card, which is sometimes sold in vending machines.