* The "as low as" figure is the lowest per-day rate, taken from the longest unlimited data plan on sale here.
Here's how Onetel stacks up against other options in Japan.
Prices shown in USD
7 days of unlimited data in Japan costs $26.24 — about $3.75 a day on NTT Docomo, KDDI (au) or SoftBank, with no roaming charge and no SIM to swap. In Japan, 5G is live and median mobile download speed is 55.2 Mbps.
Choose a Japan eSIM by matching the allowance to your trip length and expected use, then check the existing network table for phone compatibility. The page keeps its country-specific operator, band and median-speed information, while the sections below help you compare plan sizes and use official coverage information for the places on your itinerary.
Start with the length of your stay, then allow for navigation, messaging, streaming and work use. A fixed-volume plan gives you one data pool across its stated validity period.
Best for: A short city visit where mobile data is mainly for maps, messages and occasional browsing.
This is the smallest fixed-volume profile for a stay of up to seven days.
Usage tip: Use Wi-Fi for video, photo backups and app updates to keep more data available while exploring.
Best for: Trips of up to two weeks with regular navigation, messaging and light social-media use.
The 3 GB allowance remains available across the stated fifteen-day validity period.
Usage tip: Download maps before rail journeys and use mobile data for live directions and updates.
Best for: Longer stays or travellers planning regular streaming, video calls or work-app use.
A larger thirty-day data pool gives heavier activities more room than the short-trip profiles.
Usage tip: Compare your normal phone usage with the available allowances and monitor usage during the trip.
Your eSIM roams onto Japan's own operators. These are the networks and the frequencies they run — check your phone supports them before you travel.
Source: Ookla Speedtest Global Index, July 2025
Subway and underground rail tunnels in Tokyo and Osaka have near-universal LTE/5G coverage, but mountainous rural areas in central Honshu and Hokkaido have significant coverage gaps. Band 11 (1500 MHz) and Band 18/26 (800/850 MHz) are Japan-specific LTE bands often absent from foreign phones, limiting rural and indoor coverage for roaming devices.
Official operator coverage information can be used to check 5G and LTE service by location. NTT Docomo's map includes prefecture-level lookup plus separate information for mountain trails and subways; use the map that matches the selected product's network details.
Check the neighbourhood around each hotel and the stations you expect to use. Official operator information can also identify service areas at stations, airports and other locations.
Use the separate mountain and route information where available, and check the destination as well as the journey. Compare your phone with the lower-frequency bands in the existing network table.
Check island and regional itineraries location by location. For travel beyond Japan, compare a matching country plan with a regional option and confirm every included country before departure.
Compare your phone with the 4G and 5G bands in the existing Japan network table. The published network notes highlight B11 and B18 or B26 as bands that can matter for some Japanese networks, alongside the other frequencies listed on the page.
Keep the QR code and installation instructions available offline, and complete each step according to the selected product's instructions.
When validity starts: Validity-start rules can differ by product. Check the selected plan details before installation and travel.
Plan a calmer first trip to Japan: choose a season, shape a realistic Tokyo–Kyoto–Osaka week, understand trains and IC cards, carry the right mix of payment methods, and avoid common etiquette mistakes.
Reliable internet access makes travel smoother. A local SIM card or a portable Wi-Fi router is the most dependable option for most visitors. You can buy a prepaid SIM at airports, electronics stores, or online for delivery to your hotel. Pocket Wi-Fi, often rented by the week, gives unlimited data and can connect multiple devices. Both options work with Google Maps, which is essential for navigating train routes and walking directions.
Free public Wi-Fi is available in many train stations, convenience stores, and cafés, but connections can be slow and require registration. Download essential apps like Google Maps and a translation tool before you arrive. Japan’s mobile networks are excellent, so a local SIM or router will keep you online in cities and most rural areas.
These five are a strong start. Japan has many World Heritage sites, but trying to see everything leads to burnout. Choose a few that genuinely interest you and leave time to wander.
Japanese convenience stores also sell surprisingly good onigiri, egg sandwiches, and fried chicken. Eating well in Japan does not require a big budget.
Spring (March-May) is Japan’s most popular season. Cherry blossoms peak from late March to mid-April, drawing large crowds. Book accommodation months ahead. Top viewing spots include Kyoto’s Maruyama Park and Tokyo’s Ueno Park. Temperatures are mild, but rain is possible.
Autumn (October-November) offers cooler weather and striking foliage. Peak colours vary by region, generally mid-October to late November. Popular spots include Nikko, Kyoto’s Eikan-do, and Hokkaido’s Daisetsuzan. Crowds are smaller than spring, but weekends can still be busy.
Summer (June-August) is hot and humid. Rainy season runs June to mid-July. Fireworks festivals and hiking in cooler mountain areas are highlights. Winter (December-February) is cold but clear in many regions, with excellent skiing in Hokkaido and the Japanese Alps. Avoid the New Year holiday week when many businesses close.
The details worth knowing about your Japan eSIM
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