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?)
|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)
or (Pocket SIM)
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.