The 3 Best eSIMs for Japan in 2026: Top Picks for Unlimited, Budget & Overall

Heading to Japan soon? Then a reliable eSIM is essential. In a country where signs can be hard to decipher and the language barrier is real, a working internet connection isn't a luxury, it's a basic necessity. But how do you stay connected without racking up a massive roaming bill?

With over 200 eSIM providers promising fast, reliable coverage, and some even "unlimited data", it's hard to know what to believe. Most perform well, but I found big differences in price and quality, and there are one or two I'd personally avoid.

I bought and tested 15 of the most popular eSIMs myself. There's no single best eSIM for everyone, but there are three clear winners per category:

• Best for heavy users (unlimited): Sim Local
• Best all-rounder (value and coverage): Ubigi
• Best for the wallet (budget): Pingwe

Read on for my honest, hands-on review, or jump straight to our Japan eSIM comparison.

Short on time? Use code FYESIM10 for 10% off my all-round top pick Ubigi, with premium coverage on both Docomo and au.

How to Choose the Right eSIM for Japan?

Looking for a Japan eSIM? The best eSIM depends entirely on your specific needs. Here are my top tips to avoid common pitfalls:

• Check your home data usage: Most travellers use around 10 GB per month in daily life. Check your latest mobile bill first. There's usually no need to overpay for expensive "unlimited" plans.
• Network matters: In big cities like Tokyo, any network works. For rural areas or hiking, I strongly recommend an eSIM on Docomo (preferably) or at least au for reliable coverage.
• The "unlimited" reality: Be sceptical. If a provider doesn't clearly state a daily limit (for example "3 GB per day"), assume you'll be throttled quickly. Demand transparency.
• Hotspotting: Need to share data with family, or connect your laptop? Some (unlimited) plans strictly block or limit this. Check the terms carefully before buying.
• Ignore generic ratings: A five-star general score means little for Japan performance. Rely on specific, hands-on local tests.
• Don't just look at speed: A high download speed is useless if there's a big delay on the line. Some providers route your data around the world (for example via Europe) before it reaches your phone. This makes Google Maps feel slow and calls stutter, even on 5G.

Finally, don't forget to check compatibility. Most smartphones released from 2019 onwards are supported, but make sure your device isn't carrier-locked. While this is rare nowadays, it's always worth double-checking.

How much data do you actually need? Use our data calculator to estimate what you'll really use. Want to compare prices? Browse all 35+ providers via our Japan eSIM comparison tool.

Unlimited data eSIM for Japan

I tested several "unlimited" plans in Japan. Sim Local was the clear winner, though Truely, Ubigi and IIJ (via iRoamly) also performed well. Unfortunately, both Holafly and Yesim disappointed.

Note: unlimited always comes with a fair use policy. Limits and network partners can change.

Top contenders

• Truely: The best alternative. It features a local IP address, a generous 5 GB per day high-speed limit, and download speeds reaching 200 Mbps.
• Ubigi: Excellent connection quality and a local IP. Read more.
• iRoamly (IIJ): A strong budget option running on the Docomo network, though it lacks 5G access. iRoamly claims genuinely unlimited data with no hard cap; in my tests I used 6 GB with no noticeable throttling. Note: this applies specifically to iRoamly's local IP offering, not their standard unlimited plan.

The middle ground

• Saily (5 GB per day via Hong Kong) and Jetpac (3 GB per day via Singapore): Both offer decent transparency but rely on non-local routing. Saily lets you select an IP address from over 100 countries. Jetpac offers perks like lounge access during flight delays, plus free Google Maps and WhatsApp even after your data allowance runs out.
• Firsty: Offers flexible daily plans, but suffers from performance hiccups due to inefficient routing via Mauritius.

Unlimited plans with real limits

• Holafly: Their FAQ states that if usage exceeds 90 GB per month, speeds may be temporarily reduced to as low as 256 kbps (256 to 1024 kbps), which would make even basic browsing and messaging unworkable. Spread evenly across 30 days, that's roughly 3 GB per day. In my tests, my IP alternated between Shanghai (China) and Singapore, and when the Chinese IP was active I had occasional access issues with some services. Holafly peaked at just 50.8 Mbps, and the higher latency made it less suitable for video calls.
• Yesim: The biggest disappointment for me personally. Speeds peaked at 11.3 Mbps with a remote breakout via Europe, which made browsing feel sluggish. In a support chat (November 2025), Yesim suggested their "unlimited" plans may not be suitable for heavy data use.

Holafly will likely work for most travellers who aren't planning data-heavy tasks. But given the price, the restricted hotspotting, capped speeds and fair use policy, I find it difficult to classify it as truly "unlimited". Sim Local (my top pick) was transparent about its 10 GB daily allowance and performed flawlessly, while the pricier "premium" plans hid significant pitfalls that are invisible at checkout. Always check the fine print; if the terms are vague or hidden, look elsewhere.

All eSIM test results in Japan

I ran a strict benchmark at Shiba Park in Tokyo on 30 November 2025 (noon), using an iPhone 16 Pro. This open-air setting let every provider record its peak performance.

Key takeaways:

• Congestion is real: In crowded spots like Shibuya Crossing, speeds dropped significantly. Sim Local slowed to 10 Mbps, while Yesim and Holafly ground to a virtual halt.
• Expectations: The figures below represent peak speeds. Expect lower performance in busy city centres due to network traffic.
• Verdict: Price aside, most providers are excellent for 90% of travellers. The only outlier was Yesim's "unlimited" plan, which underperformed in my tests.

Don't stare blindly at download figures. For 99% of travellers, 50 Mbps is ample and easily handles two Ultra HD streams. Instead, pay attention to stability: a high download speed is of little value if your data is routed via a server halfway across the world, making the connection feel sluggish.

Note: Providers may change their partners, infrastructure and technical setups at any time and without notice. If a local IP address is essential for your use case, always verify this directly with the provider beforehand. These tests represent a snapshot in time; while professionally executed, they reflect my personal experience at the time of testing.

I ran a strict benchmark at Shiba Park in Tokyo on 30 November 2025 (noon), using an iPhone 16 Pro. This open-air setting let every provider record its peak performance, so expect lower speeds in busy city centres. Providers may change their partners, infrastructure and routing at any time, so verify a local IP directly with the provider if it is essential for you.

Local networks in Japan

These are the major mobile networks in Japan:

• NTT Docomo
• KDDI (au)
• SoftBank
• Rakuten Mobile

While 5G is widely available in urban areas and tourist hubs, 4G/LTE provides the most extensive geographic coverage across the islands.

NTT Docomo is the premium network, with the most extensive and reliable coverage, especially if you venture inland or to remote areas. KDDI (au) and SoftBank are strong competitors with excellent high-speed data in the urban tourist hubs. Ubigi users benefit from access to both Docomo and au. You can read more about current performance in the OpenSignal Mobile Network Experience report.

However, 5G access and speeds depend entirely on your eSIM's specific (roaming) agreements. In my test, Airalo, Sim Local, Ubigi and Truely made the best use of Japan's powerful networks.