Japan operates mobile networks on 4G LTE bands 1, 3, 8, 11, 18, 19, 21, 26, 28, 41, 42 and 5G on n77, n78, n79, n257. The three major carriers are NTT Docomo (market share approximately 38 percent as of 2023), au by KDDI (approximately 27 percent), and SoftBank (approximately 22 percent). Rakuten Mobile entered as the fourth carrier in April 2020. Foreign visitors cannot purchase standard Japanese postpaid contracts due to residency requirements and credit checks tied to Japanese banking systems. All visitor options are prepaid.
Tourist SIM cards became available at Narita International Airport and Haneda Airport starting in 2014 when the Japanese government relaxed regulations to accommodate increasing visitor numbers. Narita Airport Terminal 1 has SIM card vending machines after customs in the arrivals lobby on the first floor near the Keisei Line entrance. Terminal 2 has machines on the first floor arrivals area near the railway ticket counters. Terminal 3 has one machine near the Keisei Access Express platform entrance. Haneda Airport International Terminal has vending machines on the second floor arrivals lobby near the Tokyo Monorail entrance and near the Keikyu Line ticket office. Kansai International Airport in Osaka has machines in the first floor arrivals hall of Terminal 1 near the JR and Nankai railway ticket offices.
Japan Welcome SIM issued by IIJ (Internet Initiative Japan) offers data-only plans sold through airport vending machines and electronics retailers. The 30-day 6GB plan costs 3,800 yen. The 30-day 10GB plan costs 4,800 yen. The card operates on NTT Docomo infrastructure. Activation requires scanning a QR code provided in the package and entering the SIM card number on a registration website. The process requires passport number entry. Data speeds throttle to 200 kbps after the included data allotment expires. This SIM does not support voice calls or SMS sending, though SMS receiving works for verification codes.
Mobal SIM cards operate on SoftBank network infrastructure. The Visitor SIM offers unlimited data with speeds throttled to 3 Mbps for the first 1GB per day, then 512 kbps afterward. The 8-day plan costs 3,980 yen, the 15-day plan costs 5,980 yen, and the 30-day plan costs 7,980 yen as of November 2024. Purchase occurs online before travel with shipping to home addresses outside Japan, or at Bic Camera and Yodobashi Camera electronics stores in major cities. Voice calling costs 80 yen per minute to Japanese numbers. The SIM includes a Japanese phone number capable of receiving calls. Activation requires entering the SIM card number and delivery code on the Mobal website.
Sakura Mobile offers tourist SIM cards on the Docomo network. The 30-day 6GB plan costs 3,278 yen. The 30-day 20GB plan costs 5,478 yen. These cards include 30 minutes of domestic voice calling and unlimited domestic SMS. Purchase locations include Don Quijote discount stores in Tokyo, Osaka, Kyoto, and Fukuoka. Don Quijote Shinjuku East Exit Store in Tokyo stocks Sakura Mobile SIMs at the mobile phone counter on the third floor. Activation occurs automatically when the SIM connects to the network for the first time within 90 days of purchase. The included voice minutes expire with the data plan and do not roll over.
GTN Mobile operates as a virtual network operator on Docomo infrastructure and specializes in services for foreign residents and tourists. The 10-day 6GB tourist plan costs 2,480 yen. The 30-day 10GB plan costs 3,480 yen. Purchase occurs through their website with delivery to hotels in Japan or at their physical counter in Shinjuku, Tokyo at 2-11-7 Yoyogi, Shibuya-ku on the third floor of the KT Building. The counter operates Monday through Friday from 1000 to 1800 and requires advance reservation through their website. Voice calling adds 11 yen per 30 seconds to domestic numbers.
Pocket WiFi rental provides an alternative to SIM cards for groups or travelers with multiple devices. Japan Wireless provides unlimited data devices for 1,067 yen per day with airport pickup at Narita, Haneda, Kansai, Chubu Centrair, Fukuoka, and New Chitose airports. The devices support up to 10 connected devices simultaneously and operate on SoftBank 4G LTE. Battery life reaches approximately 8 hours of continuous use. Return occurs via prepaid envelopes at airport post boxes or at hotel front desks that accept postal items. Rental period starts from the pickup date and includes the return date as a charged day.
Global Advanced Communications (GA) rents pocket WiFi devices operating on WiMAX 2+ network infrastructure. The unlimited data plan costs 970 yen per day. Speed throttling begins after 10GB of usage within three days to approximately 1 Mbps. The company operates pickup counters at Narita Airport Terminal 1 and Terminal 2 in the arrival lobbies, Haneda Airport International Terminal on the second floor arrivals area, and Kansai Airport Terminal 1 first floor. Counter hours run from 0630 to 2530 at Narita, 0600 to 2400 at Haneda, and 0630 to 2300 at Kansai. Reservation through their website reduces the daily rate to 880 yen.
Ninja WiFi operates rental counters at Narita Airport both terminals, Haneda Airport, Kansai Airport, Chubu Centrair Airport, and Fukuoka Airport. The standard unlimited plan costs 1,200 yen per day without throttling. The device operates on SoftBank and au networks with automatic switching. Battery capacity supports approximately 12 hours of active use. Pickup requires showing the reservation confirmation email and passport. Return methods include airport counters, convenience store shipment using provided Yamato Transport labels, or hotel front desk with postal service. The company charges 2,000 yen for late returns beyond the reserved period plus daily rental fees.
eSIM options became widely available for tourists in Japan starting in 2022. Ubigi offers a Japan-specific eSIM with 3GB valid for 30 days costing 900 yen, 10GB for 30 days costing 2,400 yen, and 50GB for 30 days costing 9,800 yen purchased through their mobile application. The service operates on NTT Docomo infrastructure. Activation requires scanning a QR code provided after purchase, which adds the cellular plan to compatible devices. IPhone XS and newer models support eSIM. Samsung Galaxy S20 and newer support eSIM. Google Pixel 3 and newer support eSIM. The device must be unlocked by the home carrier before travel.
Airalo provides Japan eSIMs operating on KDDI au network. The 7-day 1GB plan costs 4.50 USD. The 30-day 3GB plan costs 11 USD. The 30-day 10GB plan costs 26 USD as of November 2024. Purchase and activation occur entirely through their mobile application available on iOS App Store and Google Play Store. The eSIM profile downloads after payment through the application and installs by following prompts in the phone settings. Data-only service provides no voice calling or SMS capability. Tethering to other devices functions on most compatible phones depending on carrier unlock status.
Holafly sells unlimited data eSIMs for Japan with daily speed allocation. The 5-day plan costs 19 USD, the 10-day plan costs 34 USD, and the 30-day plan costs 84 USD. The service operates on SoftBank network. Unlimited designates no hard data cap, but speeds reduce to 512 kbps after 1GB of usage per day. The reduction resets at midnight Japan Standard Time. Customer support operates through WhatsApp and email in English, Spanish, French, and German. The company requires purchase at least 24 hours before the plan start date to ensure profile generation.
Free WiFi availability in Japan expanded significantly after 2014 through government initiatives preparing for the 2020 Tokyo Olympics. Japan Connected-free Wi-Fi application available on iOS and Google Play consolidates access to over 200,000 free WiFi hotspots operated by multiple providers including NTT East, NTT West, JR East, Tokyo Metro, and various municipalities. The application requires one-time registration with email address and password. Subsequent connections to participating networks occur automatically when in range. Coverage includes most train stations on JR lines, Tokyo Metro stations, Toei Subway stations, Osaka Metro stations, and major municipal facilities.
JR East operates JR-EAST FREE Wi-Fi at 260 stations on its network as of September 2024 including all major stations in Tokyo such as Tokyo Station, Shinjuku Station, Shibuya Station, and Ikebukuro Station. Registration requires email address entry on a web portal that appears when connecting to the SSID "JR-EAST_FREE_Wi-Fi". Each session lasts 3 hours with unlimited reconnections. The service extends to Narita Express trains operating between Narita Airport and Tokyo.
Tokyo Metro provides Metro_Free_Wi-Fi at all 180 stations on its nine lines. Registration occurs once through email or social media account authentication via Facebook, Twitter, or Google. Each session permits 3 hours of connection with a one-minute disconnection required between sessions. The network does not function inside moving trains, only on station platforms and concourses.
Family Mart, 7-Eleven, and Lawson convenience stores offer free WiFi with different systems. 7-Eleven's 7SPOT WiFi requires downloading the 7-Eleven application and registering an email address. Usage permits three 60-minute sessions per day. Family Mart's Famima Wi-Fi allows registration through email with three 20-minute sessions per day. Lawson's LAWSON_Free_Wi-Fi permits one-time registration through email or SNS accounts with unlimited 60-minute sessions separated by one-minute disconnection periods. The networks function in approximately 21,000 7-Eleven locations, 16,000 Family Mart locations, and 14,000 Lawson locations across Japan as of 2024.
Starbucks Coffee Japan operates at_STARBUCKS_Wi2 free WiFi at all approximately 1,900 locations in Japan. Connection requires agreement to terms of service through a web portal. No registration or email required. Each session lasts one hour with unlimited reconnections. The service quality varies by location density, with slower speeds during peak hours at stations and business districts.
Mobile network coverage in mountainous regions of the Japanese Alps presents gaps. The Kamikochi valley floor maintains 4G coverage from Docomo and au along the main hiking paths from Kappa Bridge to Myojin Pond, but signal disappears on trails ascending toward Mount Hotaka above 2,400 meters elevation. Mount Fuji climbing routes from the fifth station to the summit maintain intermittent coverage on the Yoshida Trail and Fujinomiya Trail on Docomo network, with more consistent coverage above the eighth station due to tower placement near mountain huts. The Gotemba Trail and Subashiri Trail show less reliable coverage below the seventh station.
Shikoku's 88 Temple Pilgrimage route maintains generally strong coverage near temples in urban areas and along National Route 32, Route 33, and Route 56 highways. Coverage gaps occur on mountain sections of the route between Temple 12 Shosanji and Temple 27 Konomineji in Tokushima Prefecture where the trail crosses Mount Tsurugi ridges. The section between Temple 44 Daihoji and Temple 45 Iwayaji in Ehime Prefecture crosses mountain forests with intermittent signal.
Hokkaido's remote regions show coverage limitations. Shiretoko National Park maintains 4G coverage in Utoro town and along Route 334 to Shiretoko Five Lakes, but the road beyond to Cape Shiretoko shows no coverage from any carrier. Daisetsuzan National Park has coverage in Sounkyo Onsen town and Asahidake Onsen, but hiking trails beyond the ropeway stations into the volcanic highland lose signal within one kilometer of trailheads. The coastal drive on Route 238 between Monbetsu and Okotsuku shows gaps in coverage in 5 to 10 kilometer stretches.
Okinawa's remote islands beyond Okinawa Island show varying coverage. Ishigaki Island maintains full 4G coverage across the populated areas and main roads, with coverage extending to most beaches on the coast. Iriomote Island has coverage in Ohara port area and Uehara port area, but the jungle interior and the kayaking routes on Nakama River show no signal after the first two kilometers upstream from the river mouth. Yonaguni Island, Japan's westernmost point, has coverage in Sonai settlement and Kubura settlement, but the coastal roads between settlements have gap sections.
International roaming in Japan functions for most major carriers worldwide. United States carriers AT&T, Verizon, and T-Mobile all support roaming on Japanese networks. AT&T roams on SoftBank and Docomo. Verizon roams on SoftBank and au. T-Mobile roams on Docomo and SoftBank. United Kingdom carriers EE, Vodafone, and Three support Japan roaming. EE roams on au and Docomo. Vodafone roams on SoftBank. Three roams on au. Canadian carriers Rogers, Bell, and Telus support roaming on SoftBank and Docomo networks.
Roaming rates vary significantly by home carrier and plan. AT&T International Day Pass costs 12 USD per day and provides unlimited data at reduced speeds after 1GB per day, using the customer's domestic plan allowances. Verizon TravelPass costs 12 USD per day with similar terms. T-Mobile includes unlimited 2G speed data at no additional charge in 215 countries including Japan for postpaid Magenta and Magenta Max plans, with 5GB of high-speed data included on Magenta Max. High-speed data passes on T-Mobile cost 5 USD for 512 MB valid 24 hours or 35 USD for 5GB valid 10 days.
Voice calls over roaming incur per-minute charges separate from daily pass fees for most carriers. AT&T charges 3 USD per minute for voice calls made or received while roaming in Japan outside the International Day Pass. Verizon charges 2.99 USD per minute outside TravelPass. SMS messages sent cost 0.50 USD to 0.75 USD per message for most US carriers while roaming. Receiving SMS typically incurs no charge.
Data speed testing by OpenSignal published in August 2024 showed average 4G download speeds of 94.1 Mbps on Docomo, 72.3 Mbps on au, 68.7 Mbps on SoftBank, and 58.2 Mbps on Rakuten Mobile. The testing covered 47 prefectures with measurements taken in urban, suburban, and rural areas. 5G average download speeds reached 318 Mbps on Docomo, 287 Mbps on au, 265 Mbps on SoftBank, and 198 Mbps on Rakuten Mobile. 5G availability remains concentrated in city centers and along major transportation corridors as of 2024.
Tokyo's Yamanote Line stations all provide 5G coverage from all four carriers. Osaka's main stations including Osaka Station, Shin-Osaka Station, Namba Station, and Tennoji Station have full 5G deployment. Kyoto Station offers 5G coverage. Fukuoka's Tenjin and Hakata areas provide 5G service. Sapporo's central ward including Odori Park and Susukino district has 5G coverage. Smaller cities show 4G as the primary service with 5G limited to the immediate downtown blocks.
Shinkansen bullet trains provide WiFi service on specific lines and train sets. JR East's Tohoku, Joetsu, and Hokuriku Shinkansen lines offer Shinkansen Free Wi-Fi on E5, E6, E7, and W7 series trains. Registration requires email address entry through a web portal after connecting to the "JR-EAST FREE Wi-Fi" or "Shinkansen_Free_Wi-Fi" SSID. JR Central's Tokaido Shinkansen between Tokyo and Shin-Osaka does not provide free WiFi service as of November 2024. JR West's Sanyo Shinkansen between Shin-Osaka and Hakata offers WiFi on N700S and N700A series trains through the "SHINKANSEN_Free_Wi-Fi" SSID requiring similar email registration. The connection quality varies depending on tunnel sections, with signal dropping in the longest tunnels.