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Our Top Recommendations
Most Popular
SoftBank K4
Fully Unlimited
Fully Unlimited
- Truly unlimited data
- 30 days: ¥4,280
- Wide coverage across Japan
- Built-in display
A well-balanced option for travelers who want unlimited data, broad coverage, and an easy-to-read built-in display.
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Best Value
SoftBank U3
Fully Unlimited
Fully Unlimited
- Truly unlimited data
- 30 days: ¥4,280
- Lightweight & compact
- All-day battery
A compact option for travelers who value portability. At approximately 149g, it is easy to carry during sightseeing and longer journeys.
Ultra-Fast 5G
SoftBank U40
Fully Unlimited 5G
Fully Unlimited 5G
- Truly unlimited data
- 30 days: ¥6,980
- Lightning-fast 5G
- Next-gen speeds
A 5G-capable option for travelers who prioritize higher-speed communication in supported areas, including video calls and high-volume data use.
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SoftBank Device List
| Device | Data Allowance | 2–3 days | 4–5 days | 7–8 days | 10–11 days | 15–31 days | Daily Rate |
|---|---|---|---|---|---|---|---|
| Fully Unlimited | ¥2,487 | ¥4,145 | ¥4,280 | ¥4,280 | ¥4,280 | ¥138/day |
U3 Fully Unlimited | Pocket WiFi | Fully Unlimited | ¥2,487 | ¥4,145 | ¥4,280 | ¥4,280 | ¥4,280 | ¥138/day |
| Fully Unlimited | ¥2,460 | ¥4,100 | ¥6,560 | ¥6,980 | ¥6,980 | ¥225/day |
 U20 Fully Unlimited | Pocket WiFi | Fully Unlimited | ¥2,487 | ¥4,145 | ¥4,280 | ¥4,280 | ¥4,280 | ¥138/day |
 G40 Unlimited | Pocket WiFi | Unlimited | ¥1,560 | ¥2,600 | ¥4,160 | ¥5,400 | ¥5,400 | ¥174/day |
U20 Unlimited | Pocket WiFi | Unlimited | ¥1,290 | ¥2,150 | ¥3,010 | ¥3,480 | ¥3,480 | ¥112/day |
 | Unlimited | ¥1,290 | ¥2,150 | ¥3,010 | ¥3,480 | ¥3,480 | ¥112/day |
 X200 Fully Unlimited | USB Modem | Fully Unlimited | ¥2,487 | ¥4,145 | ¥6,980 | ¥6,980 | ¥6,980 | ¥225/day |
U3 5GB 5GB/month | Pocket WiFi | 5GB/month | ¥618 | ¥618 | ¥618 | ¥618 | ¥618 | ¥19/day |
 WN-CS300FR Unlimited | Home Router | Unlimited | ¥1,500 | ¥2,500 | ¥4,000 | ¥5,500 | ¥5,980 | ¥192/day |
WiMAX Device List
| Device | Data Allowance | 2–3 days | 4–5 days | 7–8 days | 10–11 days | 15–31 days | Daily Rate |
|---|---|---|---|---|---|---|---|
 | Unlimited | ¥1,650 | ¥2,750 | ¥4,280 | ¥4,280 | ¥4,280 | ¥138/day |
 5G DOCK01 Unlimited | Pocket WiFi | Unlimited | ¥1,650 | ¥2,750 | ¥4,400 | ¥6,050 | ¥6,480 | ¥209/day |
 5G NC03 Unlimited | Pocket WiFi | Unlimited | ¥1,650 | ¥2,750 | ¥4,400 | ¥6,050 | ¥6,480 | ¥209/day |
 | Unlimited | ¥1,650 | ¥2,750 | ¥4,280 | ¥4,280 | ¥4,280 | ¥138/day |
 5G L13 Unlimited | Home Router | Unlimited | ¥1,650 | ¥2,750 | ¥4,400 | ¥6,050 | ¥6,480 | ¥209/day |
 W06 Unlimited | Pocket WiFi | Unlimited | ¥1,530 | ¥2,550 | ¥4,080 | ¥4,280 | ¥4,280 | ¥138/day |
au Device List
| Device | Data Allowance | 2–3 days | 4–5 days | 7–8 days | 10–11 days | 15–31 days | Daily Rate |
|---|---|---|---|---|---|---|---|
U3 6GB 6GB/month | Pocket WiFi | 6GB/month | ¥1,450 | ¥1,450 | ¥1,450 | ¥1,450 | ¥1,450 | ¥46/day |
U3 30GB 30GB/month | Pocket WiFi | 30GB/month | ¥4,410 | ¥4,500 | ¥4,500 | ¥4,500 | ¥4,500 | ¥145/day |
U3 50GB 50GB/month | Pocket WiFi | 50GB/month | ¥4,280 | ¥4,280 | ¥4,280 | ¥4,280 | ¥4,280 | ¥138/day |
docomo Device List
| Device | Data Allowance | 2–3 days | 4–5 days | 7–8 days | 10–11 days | 15–31 days | Daily Rate |
|---|---|---|---|---|---|---|---|
 5G U50 Unlimited | Pocket WiFi | Unlimited | ¥3,378 | ¥5,630 | ¥9,008 | ¥12,386 | ¥15,620 | ¥503/day |
U3 5GB 5GB/month | Pocket WiFi | 5GB/month | ¥1,875 | ¥2,680 | ¥2,680 | ¥2,680 | ¥2,680 | ¥86/day |
U3 30GB 30GB/month | Pocket WiFi | 30GB/month | ¥4,410 | ¥5,280 | ¥5,280 | ¥5,280 | ¥5,280 | ¥170/day |
How to Choose Your WiFi
Streaming or Light Use?
Netflix & YouTube lovers: Go unlimited! K4, U3, and U40 let you stream guilt-free without worrying about data limits.
Maps & messaging only: Save money with 5–30GB plans. Perfect for light travelers.
How Long Are You Staying?
Short trip (2–5 days): K4 and U3 are available from ¥2,487 and can be practical options for short trips.
Extended stay (1+ month): K4 and U3 at ¥138/day can offer strong value for longer stays.
Need Speed?
5G available: WiMAX and au offer next-gen 5G speeds in major cities like Tokyo and Osaka.
Nationwide 4G: SoftBank K4 and U3 deliver solid, reliable speeds everywhere in Japan.
Travel Style?
Backpacker: U3 weighs just 149g. Slip it in your pocket and go. Perfect for moving around.
Settled travelers: K4 has a built-in display. Easier to monitor your connection status and battery.
Frequently Asked Questions
Which device is best for first-time visitors?
The SoftBank K4 Fully Unlimited is our top recommendation for its balance of broad coverage, unlimited data, a built-in display, and a 30-day price of ¥4,280 (¥138/day).
What's the difference between Fully Unlimited and regular Unlimited?
Fully Unlimited plans are designed for high-volume use without a fixed daily data allowance. Other unlimited plans may be subject to service-specific fair-use policies or temporary speed controls, so check the conditions shown on the application page.
What comes free with the rental?
The listed benefits include round-trip shipping and a portable battery rental at no additional charge. Availability and conditions should be confirmed on the application page before booking.
Short trip vs long trip—which costs more?
Surprisingly, longer stays are cheaper! A 2-day rental might be ¥2,487, but a 30-day rental is ¥4,280 (¥138/day). The longer you stay, the better the value.