KT Japan Launched Mobile Service for Travelers
The tt mobile MVNO allows travelers to secure a Japanese phone number and SIM card before they arrive in the country.
Updated on Oct. 5, 2026 in Telecommunications
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KT Japan has launched tt mobile, a mobile virtual network operator (MVNO) service that lets users in Korea sign up and receive a USIM card before traveling. The service activates upon arrival in Japan using the NTT Docomo network.
Why it matters
The service addresses common barriers for travelers by providing a local Japanese phone number before departure, which is often required for setting up local bank accounts and housing contracts.
Student plans start at 1,210 yen per month for 5GB and reach 3,300 yen, while business plans range from 2,970 yen to 4,400 yen per month. Once the data allowance is exceeded, all plans revert to an unlimited throttle speed of 200Kbps.
The players
KT Japan
A subsidiary of the Korean telecommunications giant focused on providing connectivity and digital services for travelers and businesses in the Japanese market.
NTT Docomo
The primary mobile network operator in Japan that provides the underlying infrastructure for virtual operators like tt mobile.
The details
The service operates as an MVNO — a wireless communications provider that does not own the wireless network infrastructure it uses. By leveraging the NTT Docomo network, the service provides coverage across Japan once the USIM card is inserted and activated. Users must complete a verification process using a passport and the PASS authentication platform before the physical card is shipped.
Timeline
October 5, 2026: KT Japan officially launched the tt mobile service.
December 31, 2026: Deadline to receive a waiver for the 5,500 yen international shipping fee.
The Tech Race
This launch follows a broader industry push to digitize international telecommunications for high-mobility groups like students and business expats. It positions KT Japan to compete against traditional roaming and airport-based SIM kiosks by offering pre-arrival provisioning.
Travelers currently in Korea can sign up for the service to bypass the common struggle of obtaining a phone number after landing in Japan. The 5,500 yen shipping fee for the USIM card is currently waived for all applications submitted by the end of 2026.
The takeaway
The move demonstrates a transition toward pre-arrival digital credentialing for international travelers. Users should watch for any expansion of the data tiers or changes to the activation process after the shipping fee waiver expires on December 31, 2026.
Further reading
For more on the evolution of connectivity solutions, browse our Telecommunications section.
Source note: This article includes information reported by 조선일보.
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