Bought a so-net SIM card 1GB / 30 days for ¥3,000 and to say that it is not compatible is a polite way of saying DON'T buy it!
I have an iPhone 6 Plus model A1522 purchased as unlocked/never locked directly from Apple Store. I am on iOS 8.2.
Bought the prepaid SIM at Yodobashi Ueno and then followed the instructions:
1. Visiting the website to activate http://www.so-net.ne.jp/prepaid/a ... It downloaded a profile to my iPhone - I thought great, no need to manually enter the APN settings - or so I thought.
2. APN settings ...
APN: so-net.jp
Username: nuro
Password: nuro
Authentication type: CHAP or PAP
After the profile was loaded, I could not change any of the APN settings. After multiple attempts including changing and resetting network settings on my phone (same problem with my wife's iPhone 5S), no luck and same problem. Then went to Yodobashi Ueno and they directed me to Yodobashi Akihabara for tech support. Yodobashi Akihabara people could not get it to work either. Then phoned up so-net tech support by Yodobashi Akihabara and spent 50+ minutes doing the same thing that I did during activation without success. So-net claims that there is something wrong with my phone (yeah right) and nothing wrong at their end!
The stinking part is the way it is setup one has no access to the APN profile upon activation. As a result, you need a device where you have access to the APN profile - how do I know you ask? Well, I so happened have a Huawei E589 4G LTE mobile dongle with me and once I set the APN settings accordingly and manually, it worked in 3G mode.
What is maddening is that it claims to work on the iPhone but in reality it does not! Worst part is even their link for the iPhone does NOT work with the APN: http://www.so-net.ne.jp/prepaid/I/
Don't buy it if you just have an unlocked iPhone!

