Making Calls in Japan: How Voice Calls and App Calling (Rakuten Link) Work

Quick answer

Hi, I'm Miya, and once you actually have a Japanese line, the daily worry shifts from 'how do I get a number' to 'okay, how do I place this call?' The good news is that everyday calling here is straightforward once you know the dialling pattern and a couple of small habits. In this guide I'll cover how domestic calls work, how to ring a shop or clinic politely, and how a calling app like Rakuten Link lets you make domestic calls over your data connection.

How everyday domestic calls work

Japanese phone numbers are built around a leading zero. Landlines and businesses use an area code that starts with 0 — Tokyo numbers begin with 03, Osaka with 06, and other regions have their own codes of varying length. Mobile numbers start with 070, 080, or 090. When you're calling from inside Japan, you dial the full number exactly as written, including that first 0, whether you're reaching a mobile or a fixed line.

There's no separate trunk code or extra step for a normal domestic call — you tap in the whole number and press call. The only time the format changes is if you ever dial the same number from overseas, when the leading 0 is dropped and a country code is added instead. For day-to-day life here, though, just save numbers with their 0 in front and dial them as-is, and you'll connect fine.

Calling a business or clinic

Ringing a shop, restaurant, or clinic is a very normal part of life here, and a little politeness goes a long way. A gentle 'moshi moshi' or 'osewa ni narimasu' to open, then your name and a short reason for the call, sets a warm tone. For a clinic you'll often be asked whether you're a first-time patient, your name, and a preferred time; for a restaurant, the date, number of people, and time. Speaking slowly and clearly is completely fine — staff are used to helping.

Expect that many places only take calls during their business hours, and some smaller clinics or shops have a fixed lunch break when no one picks up. You may be put on a brief hold, and you'll usually hear polite, formal Japanese (keigo). If you're nervous, it helps to jot down the few words you need beforehand, and don't worry about a perfect accent — asking someone to repeat themselves with 'mou ichido onegaishimasu' is perfectly normal and welcomed.

Calling over your data connection with a calling app

Alongside the standard dialler on your phone, some carriers offer their own calling app that places domestic calls over your data connection instead of the regular phone circuit. Rakuten Mobile's app, Rakuten Link, works this way: you open the app, it uses your Japanese number, and you dial domestic numbers from inside it to make calls. It's designed so that everyday domestic voice calls can be made for free through the app, which is why a lot of people keep it as their main way to call.

The mechanism is simple — the app carries the call over data rather than the classic voice line, while still showing your own number to the person you're ringing. Because the exact usage conditions and any exceptions can change over time, I always point newcomers to the official Rakuten Mobile page to confirm the current terms rather than relying on hearsay. Treat Rakuten Link as your neutral calling app for domestic calls, and check the source for the specifics.

Everyday calling tips

A few small habits make calling painless. Save contacts with the full 0-prefixed number so you never have to think about the format, and add a name you'll recognise later — clinics and city offices are easy to forget by number alone. When a call comes in, you'll see the number or saved name and can answer as usual; if you miss it, most people send a quick follow-up message rather than calling straight back, which is a nice, low-pressure norm here.

As for which method to use: a calling app like Rakuten Link is great for ordinary domestic voice calls when you have a data connection. For things like emergency numbers, some toll-free or special service lines, and situations where you specifically need the standard phone line, use your phone's normal dialler instead. Keeping both in mind means you're covered either way, and over time you'll just know which one to reach for.

Get a line first, then calling is easy

Everything above assumes one thing: you already have a Japanese number to call with. That's the real starting point, because both the standard dialler and an app like Rakuten Link run on the line tied to your phone. Getting connected isn't a side task here — it's the whole point, and it's what turns 'I need to call the clinic' from a worry into a thirty-second job.

With Rakuten Mobile you can apply online using just your residence card, and if your phone supports eSIM you can often be set up the same day in around fifteen minutes without visiting a store. I'd check the official page for the current terms before you apply, then let the calling part take care of itself — and I'm always here to help with the mobile side so you can get on with actually living here.