일본 커버리지

일본 수치가 뜻하는 것

중요한 숫자는 두 개인데, 모든 판매사가 인용하는 건 그중 하나뿐입니다. 일반적인 속도는 74 Mbps입니다. 상태가 좋을 때가 어느 정도인지 알려주는 숫자입니다.

읽을 값어치가 있는 건 10분위, 21 Mbps 쪽입니다. 역 위 기지국이 가득 차고 주변 사람들이 모두 같은 전파에 붙어 있는, 하루 중 아래쪽 10퍼센트일 때의 속도입니다. 중앙값이 높고 바닥이 낮은 나라는 정작 필요한 그 순간까지만 훌륭하게 작동하는 나라입니다.

영상 통화나 테더링이 꼭 필요한 여행이라면 일반 속도가 아니라 혼잡 시 수치를 기준으로 계획하세요.

일본에서 망이 붐빌 때 벌어지는 일

혼잡은 고장이 아니라 화요일 저녁입니다. 문제는 그때 eSIM이 무엇을 할 수 있느냐인데, 대부분의 여행용 eSIM은 할 수 있는 게 없습니다. 나라마다 도매 계약 하나, 망 하나, 길에 선 채로 다른 회사 eSIM을 한 장 더 사는 것 말고는 빠져나갈 방법이 없습니다.

여기서 Orbislo 트래픽은 KDDI 및 SoftBank를 지납니다. 지금 쓰는 망이 나빠지면 여행 도중이라도, 요청하지 않아도 다른 망으로 옮깁니다. 그 순간에 방해하는 대신 옮기고 나서 알려드립니다.

일본의 이동통신사

• NTT Docomo: NTT Docomo held 32.9 percent of Japan's mobile contracts at the end of March 2026 on the ministry's count, rising to 39.5 percent once lines it supplies wholesale to virtual operators are included, making it the largest of the four licensed networks.
• KDDI: The KDDI group held 26.2 percent of mobile contracts at the end of March 2026, or 31.4 percent including the lines it supplies to virtual operators.
• SoftBank: SoftBank held 18.7 percent of Japan's mobile contracts at the end of March 2026, or 24.6 percent including the lines it supplies to virtual operators, according to the communications ministry's quarterly figures.
• Rakuten Mobile: Rakuten Mobile held 3.6 percent of mobile contracts as a network operator at the end of March 2026. Virtual operators running on the other networks together held 18.5 percent.
• Rakuten Mobile, 700 MHz: In October 2023 the ministry approved Rakuten Mobile's plan to build base stations in the 770 to 773 MHz block. Rakuten was the only applicant for that 700 MHz band spectrum, which was assigned with conditions attached.

일본의 구형 네트워크

• KDDI and Okinawa Cellular switched off au's 3G service, CDMA 1X WIN, on 31 March 2022, after running it since November 2003. From 1 April 2022 au handsets that could not make VoLTE calls stopped working.
• SoftBank ended its 3G service on 15 April 2024, having postponed the January date after the Noto Peninsula earthquake. Customers living in Ishikawa Prefecture kept 3G inside that prefecture until 31 July 2024.
• NTT Docomo closed its FOMA 3G network and the i-mode service on 31 March 2026. Since then a phone that cannot make VoLTE calls, or has VoLTE switched off in its settings, cannot make voice calls on Docomo at all.

일본의 5G

• In April 2019 Japan assigned its first 5G spectrum to four operators: NTT Docomo and KDDI with Okinawa Cellular received two 100 MHz blocks each between 3.6 and 4.6 GHz, SoftBank and Rakuten Mobile one each, and every operator also received a 400 MHz block between 27.0 and 29.5 GHz.
• In December 2024 the ministry approved SoftBank's plan for the 4.9 to 5.0 GHz band, the only application it received, adding a further 100 MHz of 5G spectrum to SoftBank's network.
• At the end of March 2025, 5G reached 98.4 percent of Japan's population when the four operators' coverage is combined, and between 88.4 and 99.9 percent in each prefecture. The government's target is 99 percent nationally and in every prefecture by March 2031.
• By the end of March 2026 Japan counted 126.32 million 5G contracts, up 12.7 percent in a year, against 108.85 million 4G contracts, so 5G lines now outnumber 4G ones.

일본 네트워크 참고 사항

• Since 1 April 2026 the four network operators run JAPAN Roaming: when a disaster or major outage knocks out one network, its customers can switch to another at up to 300 kbps, or in some cases make emergency calls only. The phone shows a network name such as JPN-ROAM D, K, S or R.
• JAPAN Roaming is switched on only for large scale disasters or major network failures, not for everyday or small outages. Smartphones from roughly the spring 2026 models onward are expected to support it, and some older models gain support through software updates.
• The January 2024 Noto Peninsula earthquake took up to 839 mobile base stations off air across the four networks, 799 of them in Ishikawa Prefecture, as power cuts and severed transmission lines spread. KDDI, SoftBank and Rakuten Mobile finished emergency restoration on 15 January and Docomo on 17 January, except where landslides blocked access.