Japanese for a Mobile Phone Contract in Japan

How the shop conversation is shaped

The assistant works through a checklist in a fixed order, and the whole appointment commonly runs past an hour. Line first, then handset, then plan, then options, then payment, then identity checks, then a long read-aloud of confirmations that you tap or initial one by one. Knowing the order matters more than knowing every word, because it tells you which question is coming next and lets you prepare the one sentence you need.

Two things make it hard for a learner. The vocabulary is specialised and almost none of it appears in a beginner course, and the money is quoted in layers: a handset price, a monthly plan, discounts that expire on different dates, and options that are free for a while and then quietly are not. Nobody is hiding this from you, but nobody volunteers a single clean number either.

Opening the conversation

Say what you have come for in your first sentence and the assistant can route you immediately. Shops are often busy and many require an appointment, so it is worth asking about that before you travel across town. It also helps to be honest about your Japanese at the start rather than halfway through the plan explanation; asking for slow speech and for figures to be written down is a normal request, not an apology.

The reply to the first line is usually a question back: shinki desu ka, kishu henkō desu ka, norikae desu ka. Those three cover a brand new line, keeping your provider but changing handset, and moving to a different provider with your number. Knowing which of the three you are means you answer in one word instead of describing your situation from scratch.

Documents, payment, and the things people forget

Contracts are refused at the identity stage more often than at any other point, and almost always for the same reasons: a document with an old address, a payment card in somebody else's name, or a residence card that expires soon. Sort those out before the appointment rather than at the counter, because a shop cannot waive them. Take more paperwork than you think you need; nobody has ever been sent home for bringing a spare document.

• 本人確認書類 (honnin kakunin shorui): photo identification, typically a residence card or Japanese driving licence.
• An address that matches that document, so update the card first if you have moved.
• 支払い方法 (shiharai hōhō): a Japanese bank account for direct debit, or a credit card in your own name.
• 印鑑 (inkan): still requested at some counters for the direct-debit form even where a signature is allowed.
• 在留期限 (zairyū kigen): the expiry date on your residence card, which can limit what a shop will offer.

Plan vocabulary and the question that pins down each cost

You may also hear shibari, literally a tie, used casually for a minimum term with a penalty attached. It is a colloquial word rather than contract language, so recognise it but ask your own question with keiyaku kikan. Terms and exit fees have changed considerably in recent years, and they differ between providers, which is exactly why you ask rather than assume.

Waribiki is where most surprises live. A discount is a separate object from the plan, it has its own start and end date, and several can run at once on different clocks. When one ends, the monthly figure rises without any notice that feels like a notice. Asking how many months each discount lasts turns an unpleasant future into a date you already know about.

Asking what you will actually pay

The figure quoted first is nearly always the promotional monthly amount, with handset instalments, temporary discounts and free option periods all folded into it. The number you want is the steady one: what leaves your account in the thirteenth month, after the introductions have ended and the trials have converted. Ask for it explicitly, ask for it on paper, and ask again if the first answer arrives as a range rather than a number.

SIM only, eSIM, and keeping your number

If you already own an unlocked handset, a SIM-only contract removes the instalments, which are usually the largest single layer of cost, and shortens the appointment considerably. An eSIM removes the physical card too and can often be issued the same day, though not every handset supports one. Keeping your existing number when you move provider is called number portability. It is routine, but it follows a procedure with a time limit, so begin it before you cancel anything.

Declining the extras politely

Options arrive near the end, usually described as free for the first month or as a condition attached to a discount. A few genuinely are conditions; most are not. The polite refusal is not a flat iranai, which sounds blunt from an adult in a shop. Kekkō desu, said with a small thank you, is the standard no, and it works far better than hesitating, because hesitation is read as interest and the explanation simply continues.

Before you sign

The signing stage is a rapid read-aloud of confirmations, each followed by a request to tap or initial. It is built for speed and staff will not slow down unless asked, so ask. Chotto matte kudasai is not rude at this point, and an assistant who has just spent an hour with you will not begrudge two minutes of reading. Everything worth checking fits on one short list.

• The steady monthly figure once every discount has ended.
• The end date of each discount and of each free option period.
• Whether the handset is on instalments, and what happens to them if you leave early.
• The minimum term, and the charge for leaving inside it if there is one.
• The date the payment is taken from your account each month.
• How to cancel later, and whether that can be done online or only in a shop.

Changing a plan later

Plan changes are far easier than the original contract and can often be done in an app or by phone without visiting anyone. The reasons are the same everywhere: paying for data you never touch, or paying extra because you underestimated. Both are one sentence to fix. Note that a change usually takes effect from the following billing month rather than immediately, so always ask when the new plan actually starts.

When the bill looks wrong

Start from the itemised breakdown rather than the total. Meisai is that breakdown, and nearly every surprise on a Japanese phone bill turns out to be one of three things: a free option that converted to a paid one, a discount that reached its end date, or a first month billed for a part period. Describe what you can see and ask them to explain it. The tone that gets things corrected fastest is puzzled rather than angry.

A lost phone, and cancelling the line

If a handset is lost or stolen, the first call goes to the provider to suspend the line, not to the shop. Suspension stops calls and data running on your number and can be lifted again if the phone reappears, so do it before you spend an evening searching. A report at the nearest police box gives you the reference that an insurance claim or a replacement application will ask for later.

Cancelling is the one stage that is less convenient than signing up, and it is worth allowing time for it. Ask three questions and nothing can ambush you afterwards: the date the line actually stops, whether any handset instalments continue after that date, and whether the final month is charged in full or in part. Get those answers before you agree to anything.