How to Choose a SIM Card

A simple guide to the kinds of SIM cards you can use in Japan and how to choose one.

You need a SIM card or eSIM to use your phone in Japan. Understanding the main options helps you avoid paying for the wrong plan.

Main types of SIM service

• Travel or short-term SIM: easy to buy right away, often data-only
• Low-cost monthly SIM (MVNO): cheaper for long stays, but may require Japanese paperwork
• Major carrier plan: more expensive, and the signup flow is often fully in Japanese

Important point

Your phone must be unlocked to use a Japanese SIM.

A practical order for new arrivals

1. Use a travel SIM or eSIM when you first land

2. Switch to a monthly Japanese plan after your basic paperwork is ready

Useful Japanese words on the signup page

• 月額: monthly fee
• データ容量: data allowance
• 通話: voice calling
• SMS: text messaging
• 契約期間: contract length