MNP / switching carrier (Mobile Number Portability)
MNP（携帯電話番号ポータビリティ）／乗り換え MNP / norikae
Moving to a different carrier while keeping the same phone number. In shops and advertisements this is commonly called norikae (乗り換え), meaning switching carrier.
MNP lets you change carrier or brand and keep your phone number. In everyday Japanese, shops and advertisements commonly call this 乗り換え (norikae, switching carrier). You start it with your current carrier — either by getting an MNP reservation number, or through a 'one-stop' MNP where the new carrier pulls the information for you.
MNP is about the phone number and the carrier. It is not the same as a Plan Change (staying with the same carrier and only changing your pricing plan), and it is not a Device Upgrade.
用語辞典
関連ガイド
Cancellation / early-termination fee契約解除料／解約料keiyaku 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 emailキャリアメールkyaria mēru
An email address given by a mobile carrier, such as @docomo.ne.jp, @au.com / @ezweb.ne.jp or @softbank.ne.jp.
Contract change契約変更keiyaku henkō
A broad term for changing the details of an existing contract — plan, options, name, or payment method.
Device upgrade機種変更kishu henkō
Getting a new device while staying with your carrier and keeping your number.
電気再通電・彩天再点saiten
通常、新規の入居契約の一環として、停止された供給ポイントで電気を再び使用できるようにします。