Japan Phone GuideMobile phones in Japan, made simple.
Contract

Wechsel des Glasfaseranbieters

Wechsel von einem NTT-Großhandels-Glasfaserkollaborationsanbieter zu einem anderen, wobei normalerweise dieselbe Glasfaserzugangsleitung wiederverwendet wird.

Fordern Sie beim aktuellen Anbieter eine Autorisierungsnummer für den Anbieterwechsel an und geben Sie diese vor Ablauf an den neuen Anbieter weiter. Der Wechsel erfolgt überwiegend vertraglich, Optionsübertragungen, IP-Telefonnummern, Router und IPv6-Einstellungen bedürfen jedoch einer Bestätigung.

Kündigen Sie nicht zunächst die alte Glasfaser, es sei denn, Sie werden dazu aufgefordert: Dies kann dazu führen, dass ein Anbieterwechsel zu einer Neuinstallation führt und Ausfallzeiten verursacht. Bestätigen Sie das Änderungsdatum, die letzte alte Rechnung, die neue Anfangsgebühr und alle Dienste, die nicht automatisch verschoben werden.

Dictionary

Related guides

Cancellation / early-termination feekeiyaku kaijo-ryō / kaiyaku-ryō
A charge that may apply when a newly opened line is cancelled within a defined period (often 12 months). Rules differ by plan and contract start date; device installments, options and same-month cancellation charges are separate.
Carrier emailkyaria mēru
An email address given by a mobile carrier, such as @docomo.ne.jp, @au.com / @ezweb.ne.jp or @softbank.ne.jp.
Contract changekeiyaku henkō
A broad term for changing the details of an existing contract — plan, options, name, or payment method.
Device upgradekishu henkō
Getting a new device while staying with your carrier and keeping your number.
Stromwiederbelebung / Saitensaiten
Strom an einem stillgelegten Versorgungspunkt wieder nutzbar zu machen, in der Regel im Rahmen eines neuen Einzugsvertrages.

Sources

Japan Phone Guide

A personal information site about mobile phones in Japan — made and kept up by one person, not a company or a carrier. It does not sell contracts.

Explore

Tools

A personal information site, run by one individual. Not a company, not a carrier, and not affiliated with any of them.

The information here is shared in good faith but may be incomplete, out of date or wrong. Use it at your own risk: no responsibility or compensation is accepted for any loss, cost or disadvantage arising from this content or from anything done based on it. Always confirm with the official source — and, where it matters, a qualified professional — before you decide.

Plan names, prices and conditions were checked against the linked official sources as of 2026-08-29 (JST). Terms can change; confirm the official page before applying.

NTT DOCOMO, au, KDDI, SoftBank, Rakuten Mobile, ahamo, povo, LINEMO, UQ mobile, Y!mobile, and other carrier, brand and plan names are trademarks of their respective owners. Netflix, Disney+, DAZN, Amazon, Amazon Prime Video, Amazon Music, Hulu, Lemino, Apple Music, Spotify, YouTube and other service names are trademarks of their respective owners. This is a personal site, not affiliated with, endorsed by or sponsored by any of them, and uses these names only to describe the services factually.

© 2026 Japan Phone Guide. Official source: 総務省 / MIC.