Shikoku and the 88 Temple Pilgrimage: Mobile Internet on the Island (2026)

Shikoku is the quietest of Japan's four main islands, and its 88 Temple Pilgrimage (the Shikoku Henro) traces a loop of roughly 1,200 km around it. Whether you walk, cycle or drive it, the question of Shikoku mobile internet comes up fast: does the network hold on mountain trails, between two temples, at the far end of Kōchi? Short answer: yes in about 95% of cases, with a few clean, predictable dead zones elsewhere. Here's how to stay connected along the route, which maps and apps to carry, and which data eSIM to pick for your pace.

The 88 Temple Pilgrimage, in brief

The Shikoku Henro follows the footsteps of Kūkai (Kōbō Daishi), the monk who founded the Shingon school and was born on Shikoku in the 8th century. The 88 temples are spread across the island's four prefectures, each tied to a stage of the journey: Tokushima (awakening), Kōchi (discipline), Ehime (enlightenment) and Kagawa (nirvana). The loop traditionally begins at Temple 1, Ryōzen-ji, in Naruto near Tokushima, and closes at Temple 88, Ōkubo-ji, in the mountains of Kagawa.

Many pilgrims (the o-henro-san) continue to Mount Kōya, in Wakayama prefecture, to thank Kūkai at the Oku-no-in: that's the symbolic close of the route. Expect 1,150 to 1,200 km and 40 to 60 days on foot for the full loop, versus 10 to 14 days by bicycle and about a week by car. Japan's national tourism organization lays out the route and temples on its official Shikoku page.

Most travelers don't do all 88 temples at once. They tackle one prefecture, a stretch around Matsuyama and its Temple 51 (Ishite-ji) next to the Dōgō Onsen baths, or the flat, easy Kagawa section around Takamatsu. Either way, your phone becomes your map, your booking notebook and your translator. That's why a reliable connection matters from the first temple to the last.

Mobile coverage across Shikoku

Shikoku is no empty island: 3.7 million people live here, and the four prefectural capitals (Tokushima, Kōchi, Matsuyama, Takamatsu) are cities of several hundred thousand with full 4G/5G. All three national carriers are present: NTT Docomo, KDDI (au) and SoftBank, plus Rakuten Mobile in urban areas. For a pilgrimage that crosses mostly countryside and mountains, NTT Docomo is the reference choice: it has the best rural coverage in the country.

In concrete terms, Docomo reports 4G/LTE coverage of around 99.9% of Japan's population, and its official coverage map, published on the NTT Docomo website, shows that inhabited valleys and main roads on Shikoku are served. Our data eSIMs run on this Docomo network, so you're on the densest infrastructure the moment you leave the cities — which makes all the difference on a route like the henro.

In practice, walking between two temples almost always happens with signal: prefectural roads, village crossings, the edges of JR Shikoku stations. SoftBank and au cover cities and coastal routes well, but are patchier in the mountainous interior of Kōchi and Ehime. If you want the detail on how networks differ, our guide to eSIM coverage in rural Japan explains why Docomo keeps the edge far from big cities.

Where the network really drops: mountains and trails

Let's be honest: a few stretches of the henro will leave you without bars. These aren't surprises, they're well-known spots, almost always forested trails at altitude. The most famous is the climb to Temple 12, Shōsan-ji, nicknamed the "temple that makes pilgrims cry": several hours of steep forest above Tokushima where signal drops in places. Same story for Temple 20 (Kakurin-ji) and Temple 21 (Tairyū-ji), linked by a ridge path, or for Temple 60 (Yokomine-ji) perched on the foothills of Mount Ishizuchi in Ehime.

On Kōchi's Pacific face, the long stretches between Cape Muroto and Cape Ashizuri alternate well-covered coastal roads with isolated passages where signal weakens without cutting out entirely. The road tunnels, common on these coasts, kill data while you pass through — a few seconds to a minute, no more. None of these gaps is a dealbreaker if you plan ahead.

So the real risk isn't being unreachable for hours, it's depending on an online map at the wrong moment. The fix is simple: prepare your offline maps and your lodging before tackling a pass. That's exactly what the next sections cover. For outright failures (wrong APN, data not activated), our guide to internet options in Japan walks through the settings to check.

Maps and apps for the henro

The good news is that the pilgrimage is one of Japan's best-marked routes, online and on the ground (the red henro michi arrows). For apps, three tools cover 90% of needs: Google Maps for general navigation and transit, Maps.me or Organic Maps for offline topographic maps, and Japan Travel by NAVITIME for JR Shikoku train and bus connections. Remember to download the Shikoku area in Google Maps "offline maps" before you leave.

For the henro itself, dedicated apps exist, like "Shikoku Henro" and the GPX tracks shared by walking communities. They show the 88 temples, the lodges, the water fountains and the grocery stores. The trick is to keep these tracks stored locally on your phone so they work even without signal. If you're building your travel app kit, our pick of the best apps for traveling in Japan covers each one.

Translation and logistics also run on data: Google Translate (with Japanese downloaded offline), Google Lens to read temple signs, and booking apps. One detail that matters: the temple stamping (the nōkyōchō calligraphy book) is done on site, but checking the stamp office hours (usually 7 a.m. – 5 p.m.) saves you from arriving at a closed door. Here again, a reliable connection saves precious time.

Booking lodging along the route

On the henro, lodging is as varied as the route: traditional ryokan, minshuku (family guesthouses) near the temples, business hotels in the cities, youth hostels, shukubō (lodging inside some temples) and the famous zenkonyado, free or pay-what-you-can shelters offered by locals. Many minshuku only take reservations by phone, often in Japanese: that's where your data becomes essential, to call through a translation app or go via an intermediary.

The usual platforms (Booking, Rakuten Travel, Jalan) mostly list the hotels of Tokushima, Kōchi, Matsuyama and Takamatsu. For isolated minshuku between two temples, the Henro community's "Shikoku Japan 88 Route Guide" paper book remains the reference, with the numbers to call. The ideal move: book the evening's stop around midday, while you still have signal and a clear sense of your progress. A city stay almost always gives you Wi-Fi to recharge your offline maps.

Hotspot (tethering) is included on all our plans: handy if you travel as a pair and one phone acts as the access point for the tablet carrying your maps. On the unlimited plan, this sharing stays available up to 10 GB per day at full speed — plenty for navigation and bookings. To reach the island, most pilgrims take the Shinkansen to Okayama then the Marine Liner line to Takamatsu: our article on connectivity on the Shinkansen explains what to expect along the way.

Walking or cycling: real data usage

Your usage depends mostly on your style. A "minimalist" walker opens Google Maps a few times a day, posts two or three photos in the evening and sends messages: they stay under 500 MB a day. A more connected pilgrim, who runs GPS nonstop, watches route videos and video-calling family, will climb toward 1.5 to 2 GB a day. By bike, GPS navigation runs more continuously, so expect a bit more on long stages.

Over a full on-foot loop of 40 to 60 days, the data adds up in a meaningful way: you'll inevitably pass the 30-day validity of a classic data plan, and that's exactly where the "any duration" unlimited plan earns its place. Conversely, for a one-to-two-week stretch around Matsuyama or Takamatsu, a data plan is plenty. To estimate your needs more precisely, we broke down real data usage when traveling in Japan app by app.

"On the henro, data doesn't replace the walk: it stops you from losing an hour hunting for the right trail or a bed for the night."

One often-forgotten point: battery life. In the mountains, the phone hunts for signal and drains faster. Carry a power bank and switch on battery-saver mode on long stages. Downloading offline maps also cuts usage sharply, since GPS works without constantly pulling data. With these habits, 20 GB comfortably covers one to two weeks of henro.

Which plan to pick by trip length

PlanJapan only offers data eSIMs for Japan, on the NTT Docomo network: no Japanese number, no traditional calls, but WhatsApp, iMessage and Signal work normally through your usual number in dual-SIM. Here's how to choose based on how you do the pilgrimage.

For a short trip centered on Matsuyama and Temple 51, or on the easy Kagawa section, the 20 GB plan is the best simplicity-to-price ratio. For a full loop on foot, which runs beyond 30 days, the "any duration" unlimited eSIM frees you from counting data: you enter your travel dates, and beyond 30 days several successive eSIMs cover the whole stay, all sent at purchase. The classic data plans (10, 20, 50 GB) are valid for 30 days once activated and can be installed up to six months before departure, the unlimited one within the two months before.

For activation, the habit is the same for everyone: install the eSIM before you leave, calmly, and activate it on arrival in Japan or on departure day. You land, the Docomo network takes over, and Google Maps is already guiding you toward Ryōzen-ji. If you're new to eSIM, follow our complete guide to using an eSIM in Japan, step by step.

FAQ

Is there mobile signal all along the Shikoku pilgrimage?

Yes, in the vast majority of cases. The NTT Docomo network covers cities, villages and almost every road on the henro. The only clean dead zones are a few forested trails at altitude (the climbs to Temples 12, 20-21 or 60) and some coastal tunnels in Kōchi. With your offline maps prepared, these gaps are no problem at all.

Which carrier has the best signal on Shikoku?

NTT Docomo offers the best coverage, especially in the mountainous interior and rural areas. SoftBank and KDDI (au) cover cities and coasts well but are patchier far from the main roads. Our data eSIMs run on the Docomo network, which is why they're the safest choice for a route crossing so much countryside.

Do I need an eSIM for the whole island or just one region?

A single Japan data eSIM covers all of Shikoku and the rest of the country. There is no separate "Shikoku region" plan: you buy a Japan eSIM and it works everywhere in the country, from Temple 1 to Mount Kōya. It's the same eSIM you'll use in Tokyo or Kyoto before or after the pilgrimage.

How much data should I plan for the henro?

For light use (Maps, messages, a few photos), budget under 500 MB a day, so 20 GB for one to two weeks. Heavy use (continuous navigation, video, video calls) climbs toward 1.5 to 2 GB a day. For a full on-foot loop of more than 30 days, the "any duration" unlimited eSIM removes all the math.

Can I keep my number to book lodging?

Yes. The PlanJapan eSIM provides data only, with no Japanese number. Your personal number stays active on your original SIM in dual-SIM, and WhatsApp, iMessage or Signal work normally over data. For minshuku that only take phone reservations, use a translation app or ask your previous lodging to call for you.

Does hotspot work on the pilgrimage?

Yes, hotspot (tethering) is included on all our plans. If you walk as a pair, one phone can act as the access point for a tablet or a second device carrying your maps. On the unlimited eSIM, this sharing stays available up to 10 GB per day at full speed.