Sakura Mobile Pocket WiFi Review: Still Top Choice for Japan?

Quick Decision: Traveling solo or as a couple? BitJoy eSIM starts at $11.50 and activates in 2 minutes—no airport pickup needed. Japan eSIM Plans 

In this Sakura Mobile Pocket WiFi review, we are going to cut through the marketing noise. We’ve tested the device on the ground-from the neon streets of Shinjuku to the quiet temples of Kyoto—to evaluate its real-world speed, the truth behind its "unlimited" data claims, and how the rental process actually works. We will also compare it against other pocket WiFi providers and modern alternatives like Japan eSIMs to help you decide which connectivity option fits your travel style.

What Exactly Is Sakura Mobile Pocket WiFi and How Does It Work?

For those new to the concept, Sakura Mobile Pocket WiFi is a portable router rental service. You rent a small device (about the size of a deck of cards) that connects to the Japanese cellular network—usually utilizing the robust Docomo or Softbank infrastructure. This device then broadcasts a private, secure WiFi signal that you can connect your phone, laptop, or tablet to, just like you would with your router at home.

The main appeal here is simplicity. Unlike a SIM card, you don't need to unlock your phone, swap tiny chips, or mess with APN settings. You simply turn the device on, find the network name (SSID) on your phone, enter the password, and you are online.

Crucially, this device works only in Japan. It creates a "bubble" of connectivity around you, which is fantastic for groups but means you must stay within about 30 feet of the person carrying the router.

How the Rental Flow Works Step by Step

The process is designed for tourists and is generally very smooth:

1. Book Online: Visit the Sakura Mobile website before your trip. Select the "Pocket WiFi" option and your travel dates.

2. Choose Pickup: You can pick it up at major airport counters (Narita, Haneda, Kansai, etc.) or have it delivered to your hotel or a post office.

3. Pickup on Arrival: If you chose the airport, go to the designated counter (usually in the arrival hall), show your passport and booking confirmation, and grab your package.

4. Connect: Open the pouch, turn on the router, and connect your devices using the password on the back.

5. Return: On your last day, put the device, charger, and cables into the provided prepaid return envelope and drop it in any Japan Post mailbox (found at airports and convenience stores) before you fly out.

Quick Comparison: Pocket WiFi vs eSIM for Japan (2025)

Bottom Line: If you're traveling with 3+ people, pocket WiFi is more economical (split the cost). If you're solo or a couple, BitJoy eSIM is 60% cheaper and more convenient.

Sakura Mobile Pocket WiFi Plans, Pricing & What “Unlimited” Really Means

One of the most confusing aspects of renting pocket WiFi in Japan is the pricing structure and the definition of "data limits." Sakura Mobile generally positions itself in the mid-to-premium range. It is not the cheapest option on the market, but you are paying for reliability and English-speaking support.

Pricing is calculated on a per-day basis. The longer you rent, the cheaper the daily rate becomes. For a typical short trip, you might pay around 8,000 to 10,000 JPY ($50-$65 USD) for a week, though prices fluctuate based on current exchange rates and promotions.

The Truth About "Unlimited" Data

Here is the most important part of this review: "Unlimited" rarely means truly unlimited at full speed.

Sakura Mobile, like almost all providers in Japan, is subject to a Fair Usage Policy (FUP) enforced by the network carriers.

• The Reality: If you use an excessive amount of data in a single day—usually exceeding 3GB to 5GB—your speed may be throttled (slowed down) for the rest of that day.

• Real-World Context: 3GB is a lot. It allows for hours of Google Maps navigation, social media scrolling, and web browsing. However, if you try to download huge video games or stream 4K Netflix all night, you will hit this wall.

• The Result: If you are throttled, the internet doesn't cut off, but it slows down to 200 Kbps (similar to 2G speeds), making it usable only for basic text messaging and very slow map loading.
  

Is Sakura Pocket WiFi Good Value vs Other Pocket WiFi in Japan?

Compared to budget competitors like Ninja WiFi or Japan Wireless, Sakura Mobile often costs a few dollars more per trip. However, Sakura consistently scores high on battery life and network coverage (Docomo is widely considered the best network for rural areas).

If you are a solo traveler, the cost of renting a device just for yourself is high compared to an eSIM. However, if you are a family of four, one rental fee covers everyone, making it highly economical.

Real-World Performance: Speed, Coverage & Battery Life

We put the Sakura Mobile device through its paces in Tokyo, Osaka, and on the Shinkansen bullet train.

Speed and Reliability

In major cities like Tokyo and Osaka, the performance is excellent. We consistently saw download speeds between 20 Mbps and 40 Mbps.

• User Experience: Web pages load instantly. Instagram stories upload without delay. Video calls on FaceTime or WhatsApp are stable and clear.

• Latency: Ping times were low (usually under 30ms), meaning the connection felt snappy and responsive.

Coverage (City vs. Rural)

Because Sakura utilizes the Docomo or Softbank networks, coverage is about as good as it gets in Japan.

• Urban Areas: Flawless 4G/LTE signal.

• Underground: Works surprisingly well in Tokyo Metro subways.

• Shinkansen: This is the ultimate stress test. The signal is generally usable for maps and messaging while moving at 300km/h, but expect the connection to drop or buffer when the train enters long tunnels.

Battery Life

The device manufacturer claims up to 20 hours of battery life. In our testing, with two phones connected and heavy usage (Maps, photos, browsing), we realistically got 10 to 12 hours of continuous use. This is enough for a full day of sightseeing, but we highly recommend carrying a small power bank just in case, especially if you are connecting 3+ devices.

What Happens After You Hit the Fair Use Limit?

To test the FUP, we intentionally downloaded several large movie files. Once we crossed the 3GB threshold for the day, the speed dropped to 200 Kbps (not the 128 Kbps some older reports mention - Sakura updated this in 2025). At 200 Kbps, Google Maps still loads slowly, and WhatsApp text messages go through, but Instagram and YouTube become unusable. The speed resets automatically at midnight.

Tip: Save your heavy downloading (Netflix offline episodes, backups) for your hotel's WiFi.

Rental Experience: Ordering, Pickup, Return & Hidden Risks

The user experience with Sakura Mobile is polished and English-friendly, which is a huge plus for non-Japanese speakers.

• Pickup: The airport counters can get busy during peak arrival times. Be prepared to queue for 10-15 minutes if a large flight has just landed. Hotel delivery avoids this but requires you to navigate to your hotel first without internet (unless you use free airport WiFi).

• Ease of Use: The pouch comes with a clear English manual. Troubleshooting is rarely needed—it really is "plug and play."

• Return: The prepaid return envelope is a lifesaver. You don't need to weigh it or buy stamps. Just seal it and drop it in a red post box.

Hidden Risks to Consider

While convenient, renting hardware comes with liability.

• Loss/Damage: If you lose the device, you could be charged a replacement fee of around 20,000 JPY (~$130 USD).

• Extra Baggage: You have to carry the router, the cable, and often a power bank. It adds weight to your day bag.

• Charging Discipline: You must remember to charge both your phone and the router every night. If the router dies, your map dies.

Troubleshooting: What If the Pocket WiFi Doesn’t Work?

If you find yourself without a connection, try this checklist:

1. Restart: Turn the device off and on again (fixes 90% of issues).

2. Check Signal: Look at the screen. If there are no bars, you might be in a dead zone (deep tunnel or basement). Move to a window or ground level.

3. Re-connect: Forget the WiFi network on your phone and rejoin.

4. Check Data Usage: Did you hit the FUP limit? If speeds are slow but the signal is strong, you likely have to wait until tomorrow.

5. Contact Support: Sakura Mobile offers email support, though response times vary.

Pros & Cons of Sakura Mobile Pocket WiFi for Travelers

Pros:

• Shareable: Connect up to 10-15 devices (ideal for families/groups).

• Coverage: Excellent reliability on major Japanese networks.

• Battery: Lasts a full day of touring.

• Simplicity: No technical setup on your phone required.

• Support: Fully English service and manuals.

Cons:

• Bulk: Another device to carry and charge.

• FUP: Risk of throttling if you use too much data.

• Logistics: Pickup and return require planning.

• Liability: Fees for loss or damage can be steep.

• Tethering: You must stay close to the device holder.

Sakura Mobile vs Other Pocket WiFi vs Japan eSIM: Which One Fits You?

You essentially have three options for internet in Japan: Pocket WiFi, a Japan eSIM (like BitJoy), or relying on free WiFi (not recommended as a primary source).

Sakura Mobile vs Ninja WiFi vs Japan Wireless

Here's how the costs compare for a typical 7-day trip:

Ninja WiFi: ¥5,390 (~$38 USD with 35% discount for 10GB/day plan)

• Often slightly cheaper than Sakura for longer rentals
• Users occasionally report older device models with shorter battery life
• Best for: Budget-conscious groups

Japan Wireless: ¥4,600 (~$33 USD for Business WiFi)

• Truly unlimited data (no 3GB cap)
• Comes with free power bank
• Best for: Heavy data users, long trips

Sakura Mobile: ¥3,940 (~$28 USD at ¥563/day)

• Cheapest pocket WiFi option for short trips
• Strong Docomo network (99% coverage)
• 3GB/day Fair Usage Policy
• Best for: Groups wanting reliable coverage

BitJoy eSIM: $11.50 (3GB/15 days)

• 60% cheaper than any pocket WiFi for solo travelers
• Instant activation, no device rental
• 5-day refund guarantee
• Best for: Solo travelers and couples

Verdict: For groups of 3+, Sakura Mobile offers the best value per person. For solo travelers and couples, BitJoy eSIM saves significant money while offering more convenience.

Pocket WiFi vs Japan eSIM (BitJoy) vs Free WiFi

This is the biggest decision modern travelers face.

• Pocket WiFi (Sakura): Best for groups and families. If you are splitting the cost between 4 people, it is incredibly cheap per person. It is also the only option if your phone is locked to a carrier or doesn't support eSIM technology.

• Japan eSIM (BitJoy): Best for solo travelers and couples.

  • Why? An eSIM from BitJoy is digital. You scan a QR code, and you have data instantly. No pickup queues, no device to charge, no return envelopes.

  • Cost: BitJoy Japan eSIM plans start at $4.50 for 1GB/7 days. For a typical 7-10 day trip:

    • 3GB/15 days: $11.50 (best value - covers your trip with buffer)
    • 5GB/30 days: $16.00 (for heavier users)
    • 10GB/30 days: $26.00 (for digital nomads)

    For 1-2 people, BitJoy eSIM costs 60-70% less than renting a Pocket WiFi router.

    Unique Benefits:

    • 5-day refund guarantee (valid through December 31, 2025) - if it doesn't work, get full refund
    • Accepts cryptocurrency (Bitcoin, USDT, ETH) for complete payment privacy
    • Works on both SoftBank and KDDI networks for better coverage

  • Freedom: You can split up! If you have an eSIM and your partner has an eSIM, you can go to different shops in Akihabara and still message each other. With a pocket WiFi, you are tethered together.

• Free WiFi: Japan has improved its free WiFi (at convenience stores and stations), but it is patchy, insecure, and often requires tedious logins. Use it as a backup only.

Who Should Choose Sakura Mobile Pocket WiFi? The Verdict

After testing the service extensively, here is our honest recommendation:

Choose Sakura Mobile Pocket WiFi if:

• You are traveling in a group of 3 or more.

• You have multiple devices (laptop, tablet, phone) that all need internet.

• You are not "tech-savvy" and want a physical device that just works.

• Your phone is carrier-locked or does not support eSIM.

Consider a Japan eSIM (like BitJoy) instead if:

• You are traveling solo or as a couple.

• You want to travel light (no extra gadgets).

• You have an eSIM-compatible phone (iPhone XR or newer, most recent Samsungs/Pixels).

• You want internet the second your plane lands without waiting in line at a counter.

Verdict: Sakura Mobile Pocket WiFi is a reliable, high-quality service that justifies its price for groups of 3 or more travelers. However, for the modern solo adventurer, the convenience and freedom of a Japan eSIM often outweigh the benefits of a rented router.

For solo travelers and couples, here's why BitJoy eSIM wins:

• 60-70% cheaper ($11.50 vs $28-38 for a week)
• Instant 2-minute activation (vs 2-3 hours for airport pickup)
• 5-day refund guarantee valid through December 31, 2025
• Accepts cryptocurrency (Bitcoin, USDT, ETH) for privacy
• No hardware to carry, charge, or risk losing
• Can split up (not tethered to one device holder)

Why BitJoy eSIM is Different (If You're Solo or a Couple)

5-Day Refund Guarantee (Valid Through Dec 31, 2025)

Unlike pocket WiFi where you risk ¥20,000 (~$140) for lost or damaged hardware, BitJoy offers complete peace of mind:

• Try the eSIM risk-free for 5 days
• If it doesn't work with your phone (rare but possible), get a full refund
• Change your mind? No questions asked
• Simply email support@thebitjoy.com or WhatsApp

Real scenario: You buy BitJoy eSIM before your trip. It doesn't connect properly at the airport. You email support, get refunded, and rent a pocket WiFi instead. You risk nothing.

Accepts Cryptocurrency

BitJoy is one of the only Japan eSIM providers accepting Bitcoin, Ethereum, and USDT.

Why this matters:

• Complete payment privacy (no credit card required)
• Lower fees for international transactions
• Perfect for digital nomads without traditional banking
• No foreign transaction fees from your bank

Instant Activation (2 Minutes vs 2 Hours)

Sakura Pocket WiFi timeline:

1. Land at Narita (1 hour)
2. Clear immigration (30-60 minutes at peak times)
3. Find airport counter (10 minutes walking)
4. Queue for pickup (10-30 minutes depending on crowd) 

Total: 2-3 hours before internet

BitJoy eSIM timeline:

1. Purchase before flight (5 minutes online)
2. Receive QR code via email (instant)
3. Scan code while plane is landing (30 seconds)
4. Toggle eSIM on when wheels touch ground (10 seconds) 

Total: Internet the moment you land

No Extra Device = No Extra Problems

With Pocket WiFi:

• Must charge router every night (+ your phone = 2 chargers to pack)
• Carry router in bag all day (adds weight)
• Risk losing/damaging hardware (expensive ¥20,000 fee)
• Must stay near router holder (can't split up as a couple)
• One person becomes "the WiFi holder" (responsibility)

With BitJoy eSIM:

• Already in your phone (zero extra weight)
• No charging required (uses your phone battery)
• Each person can buy their own eSIM (freedom to split up)
• Nothing to lose or damage (digital = risk-free)
• Equal responsibility (everyone manages their own connection)

Multi-Country Travel

Planning to visit South Korea or Thailand after Japan?

Pocket WiFi: Stops working the moment you leave Japan. Must return device and rent a new one in next country.

BitJoy eSIM: Offers regional Asia eSIMs and global plans. Buy once, use across multiple countries. Simply purchase an Asia regional eSIM and use it in Japan, Korea, Thailand, Vietnam, etc.

All plans include:

• Instant activation
• 5-day refund guarantee
• SoftBank + KDDI dual network
• Unlimited hotspot sharing
• Crypto payment option
• No expiry date until activated

FAQ: Quick Answers About Sakura Mobile Pocket WiFi & Japan Connectivity

How fast is Sakura Mobile Pocket WiFi?

In city centers, you can expect 4G LTE speeds ranging from 20 Mbps to 40 Mbps. This is sufficient for video calling, streaming HD video, and fast map navigation.

Is Sakura Mobile’s unlimited data really unlimited?

Technically, yes, you stay connected. However, practically, there is a Fair Usage Policy. If you exceed roughly 3GB-5GB in a single day, your speed will be throttled to 128kbps (very slow) until midnight.

How many devices can connect at once?

Most Sakura Mobile router models support up to 10 or 15 connections. However, connecting more than 4-5 active devices will slow down the speed for everyone.

How long does the battery last? Do I need a power bank?

While advertised up to 20 hours, real-world usage usually yields about 10-12 hours. We highly recommend carrying a small power bank to ensure you aren't left without maps at the end of a long day.

Is pocket WiFi still worth it in Japan, or should I get an eSIM?

It depends on your group size:

For solo travelers or couples: BitJoy eSIM is 60% cheaper ($11.50 vs $28-38 for 7 days), lighter (no device), and activates instantly. Plus, BitJoy offers a 5-day refund guarantee valid through December 31, 2025.

For groups of 3+ people: Pocket WiFi is more economical. Sakura at ¥563/day split between 4 people = only ¥140/person ($1/day), which is cheaper than buying 4 separate eSIMs.

Quick math:

• Solo: BitJoy $11.50 vs Sakura $28 → eSIM saves $16.50 (60% cheaper)
  
• Couple: BitJoy $23 vs Sakura $28 → eSIM saves $5 (18% cheaper)  
  
• Family of 4: BitJoy $46 vs Sakura $28 → Pocket WiFi saves $18 (39% cheaper)

Read more:

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