Below is a list of prepaid SIM cards available in Japan. Currently, almost all prepaid SIM cards are only for data communications and not for voice communications. Almost all prepaid SIM cards use the Japanese national carrier, NTT Docomo's wireless networks, so there is no significant difference in coverage areas between them. All the SIM cards listed below provide nearly 100% population coverage in Japan. Please note that the information below may not be the most up-to-date.

Most of the prepaid SIM cards are provided by Japanese Mobile Virtual Network Operators (MVNOs). You can purchase these prepaid SIM cards at their stores, partner hotels, airport stores, partner electronics stores, partner discount stores, and online. You may need to show your passport when buying these SIM cards.

#	SIM Name	Provider	Usable Period	Price	Maximum Speeds	Speed Limits Start at	Where to Buy
1	NTT Communications Prepaid SIM for JAPAN	NTT Communications	7days 14days	c.¥3,200 c.¥3,800	788Mbps	100MB/Day
2	IIJ mio JAPAN Travel SIM	IIJ mio	30 days (1GB) 3 months (2GB)	c.¥2,700 c.¥4,100	300Mbps	No daily limits
3	So-net Prepaid LTE SIM	So-net	30 days (1.2GB) 30 days (2.4GB) 60 days (3.2GB)	c.¥3,000 c.¥4,000 c.¥5,000	300Mbps	No daily limits
4	b-mobile VISITOR SIM 5GB / 21Days Prepaid	b-mobile	10 days(5GB) 21 days(7GB)	c.¥2,000 c.¥3,000	225Mbps	No daily limits
5	Rakuten Mobile Prepaid SIM	Rakuten Mobile	30 days (1GB) 90 days (2GB)	c.¥3,200 c.¥4,300	262.5Mbps	No daily limits
6	Wi-Ho! Prepaid SIM	Telecom Square	7 days (2GB) 30 days (5GB)	c.¥4,100 c.¥6,000	150Mbps	No daily limits
7	BIGLOBE NINJA SIM	BIGLOBE	30 days (3GB) 30 days (7GB)	c.¥5,300 c.¥8,300	682Mbps	No daily limits
8	BOJ mobile Prepaid SIM	Beauty of Japan	7 days 15 days	c.¥3,700 c.¥4,300	150Mbps	200MB/Day
9	U Mobile Prepaid	U-NEXT	7 days 15 days	c.¥2,000 c.¥3,500	375Mbps	220MB/Day
10	SoftBank Prepaid SIM for Travel	SoftBank	31 days (3GB)	c.¥6,500	N/A	No daily limits