I have used mineo(docomo), IIJmio, DTI SIM in Japan.
I recommend mineo, IIJmio, there was no problem at all.
On the other hand, I don’t recommend DTI SIM. It’s really slow and unkindly support service.
Current all services are not supported in English unfortunately.
You can buy them on Amazon English web site or ask your Japanese neighbors.
500MB ~ 6GB
[Price: JPY]
| Eng | 500MB | 1GB | 2GB | 3GB | 4GB | 5GB | 6GB | |
| mineo (docomo) | 700 | 800 | 900 | 1,580 | ||||
| mineo (au) | 700 | 800 | 900 | 1,580 | ||||
| IIJmio | * | 900 | 1,520 | |||||
| DTI SIM | 600 | 840 | 1,220 | |||||
| DMM mobile | 480 | 770 | 850 | 1,210 | ||||
| Rakuten mobile | * | 900 | 1,450 | |||||
| OCN mobile one | * | 1,100 | 1,450 | |||||
| NifMo | 640 | 900 | 1,600 | |||||
| Biglobe | 900 | 1,450 | ||||||
| U-mobile | 790 | 1,580 | ||||||
| b-mobile | 500 | 750 | 1,000 | 1,250 | 1,500 | |||
| UQ mobile | 980 | |||||||
| Y-Mobile |
6GB ~ Unlimited
[Price: JPY]
| 7GB | 8GB | 10GB | 12GB | 15GB | 20GB | Unlimited | |
| mineo (docomo) | 2,520 | ||||||
| mineo (au) | 2,520 | ||||||
| IIJmio | 2,560 | ||||||
| DTI SIM | 2,200 | ||||||
| DMM mobile | 1,860 | 1,980 | 2,190 | 3,600 | 4,980 | 440* | |
| Rakuten mobile | 2,260 | 525* | |||||
| OCN mobile one | 2,300 | 1,800 | |||||
| NifMo | 2,800 | ||||||
| Biglobe | 2,700 | ||||||
| U-mobile | 2,480 | ||||||
| b-mobile | |||||||
| UQ mobile | 1,980 | ||||||
| Y-Mobile |