Talk:Japan/@comment-29063068-20160716072353

u-mobile prepaid sims are available at Yodobashi camera shops / online - they are called the 'Yodobashi Limited Edition'  version, and come in the same length / usage amounts as those found elsewhere:

7 days (200mb lte speeds a day) - ¥1940 (inc. tax)

15 days - ¥3020

30 days - ¥3780

I used the 7 day sim during my most recent stay in Japan on my Korean Samsung S5 LTE-A (SM-G906K) - it worked perfectly, connected instantly (once I had set the APN) and gave me fast constant LTE connection virtually all the time.

There is also a U-mobile app (I used the Android version obviously) that tells you how much data you have used, and although it is in Japanese, it is simple to use.

For most people 200mb a day should be enough considering the amount of free WiFi spots in Japan.

As a side note, I tried to roam / connect to Softbank on my existing Korean sim (to take advantage of the free wifi spot offer) but my phone simply wouldn't connect to the Softbank network, with my phone saying that it was a 'Forbidden network'. My phone would only connect to Docomo, regardless of sim.