Buying Prepaid SIM Cards at Convenience Stores | A Guide to Prepaid SIMs Available at Japanese Convenience Stores

What is a Prepaid SIM?

A prepaid SIM is a SIM card that allows you to access the internet and data services within a set period or data limit after paying in advance.

A major feature is that no contract or screening is required, and it can be used immediately after purchase.

Prepaid SIMs are mainly divided into the following two types:

1. Data-Only Type

•Used for web browsing, social media, map apps, etc.

•Can be purchased without identity verification.

•Connects to networks in most areas across Japan.

2. Voice & Data Type

•Allows for making and receiving phone calls in addition to data communication.

•Identity verification (such as a passport) is required by law.

•Some restrictions apply when purchasing at convenience stores.

For foreign visitors, prepaid SIMs are particularly convenient for the following reasons:

•No Japanese address or bank account required.

•No contract commitment; you can choose a plan that fits your travel duration.

•You can set up your communication environment immediately upon arrival in Japan.

•You can select a plan that fits your budget.

About Japanese Convenience Stores

Japanese convenience stores (often called "konbini") are retail stores that provide all kinds of products and services necessary for daily life, with tens of thousands of locations nationwide.

Most are open 24 hours a day and offer multifunctional services such as food, beverages, daily necessities, utility bill payments, and parcel pickup.

Major Convenience Store Chains in Japan

The following are the number of stores for major convenience store chains in Japan:

Seven-Eleven

21,743 stores nationwide (as of the end of February 2025). The largest convenience store chain.

Lawson

14,662 stores (as of the end of April 2025). Characterized by its blue sign.

FamilyMart

16,295 stores (as of the end of April 2025). Marked by its green sign.

Ministop

1,845 stores (as of the end of April 2025). Many stores feature eat-in spaces.

Prepaid SIM cards are mainly handled by Lawson and FamilyMart. While Seven-Eleven does not carry prepaid SIM cards themselves, they do offer IIJmio Coupon Cards (prepaid cards for adding data capacity).

Convenience stores are extremely convenient for foreign visitors, with in-store signage in English and, at some locations, English-speaking staff. Many stores also offer Wi-Fi services and ATMs with currency exchange functions.

Pros and Cons of Prepaid SIMs

Pros

No Contract or Screening Required for Same-Day Use

•No Japanese address or bank account needed.

•Data communication can be used without identity verification (for data-only types).

•Some types can be used immediately after purchasing in-store.

Ideal for Limited-Time Stays

•Duration and capacity settings can be chosen according to your travel period.

•No cancellation procedures required as they are disposable.

•Communication costs for short-term visitors can be kept low.

Easy Budget Management

•Since it is prepaid, there is little worry about additional charges.

•Capacity can be added as needed.

•No high bills due to overusage.

Convenient Purchase at Convenience Stores

•Available for purchase 24 hours a day.

•Can be found anywhere across Japan.

•Can meet sudden communication needs during sightseeing.

Cons

Can Be More Expensive Than Monthly Contracts

•For the same data capacity, it may be more expensive than a monthly contract.

•Not suitable for long-term residents.

Many Do Not Come with a Phone Number

•Since they are data-only, you cannot make or receive regular phone calls.

•Services requiring SMS authentication may not be usable.

•Options are limited if voice calls are necessary.

Some SIM Cards Require Activation Procedures

•Some types cannot be used on the same day.

•Online procedures are required, which may necessitate a separate Wi-Fi environment.

Data Top-ups May Be Limited to In-Store Products

•In some cases, capacity cannot be added online.

•Additional costs will be incurred.

From Purchase to Activation

The process from purchase to activation varies depending on the type of prepaid SIM. Here are the main patterns:

Instant Use Type

1.Purchase the SIM card at a convenience store

•Select the product at the register and pay.

•The package includes a multi-size SIM card and an instruction manual.

2.Prepare your smartphone settings

•Turn off your smartphone.

•Remove the SIM tray using a SIM pin (or a paperclip if not included).

3.Insert the SIM card

•Snap out the SIM card to the size that fits your smartphone.

•Place the card in the SIM tray and reinsert it.

4.APN Settings

•Turn on the power and perform APN settings according to the manual.

•Main setting items: Name, APN, Username, Password, etc.

•Some models may condiv automatically.

5.Confirm Internet Connection

•Turn on mobile data and check the internet connection.

•If you cannot connect, double-check the APN settings.

Application Required Type

1.Purchase the card at a convenience store

•Select the product at the register and pay.

2.Connect to a Wi-Fi environment

•Secure an internet environment for the application process.

3.Complete activation procedures online

•Access the URL provided in the package.

•Enter the numbers printed on the card.

•Agree to the terms of use and enter the required information.

•Select the prepaid type.

4.Wait for the SIM card to arrive

•The SIM card will be delivered within a few days after the application.

5.Insert the SIM card and set the APN

•Follow the same steps as 3–5 in the "Instant Use Type" above.

eSIM Type

1.Purchase the eSIM card at a convenience store

•Select the product at the register and pay.

•Receive the QR code and instruction manual printed on the card.

2.Connect to a Wi-Fi environment

•An internet connection is required to download the eSIM.

3.Download and set up the eSIM

•Scan the QR code with your smartphone camera.

•Follow the on-screen instructions to proceed with the settings.

•Download the eSIM profile.

4.Confirm Internet Connection

•Turn on mobile data and check the internet connection.

Tips for Choosing a SIM (For Foreign Visitors)

Choosing Based on Duration of Stay

•Short-term stay (about 1 week): Focus on cost-efficiency and ease of use.

•Medium-term stay (2–3 weeks): Focus on the balance between data capacity and duration.

•Long-term stay (1 month or more): It is recommended to consider a monthly contract SIM.

Choosing Based on Purpose of Use

•Mainly for gathering tourist information:

•A small capacity plan is sufficient.

•3–6 GB is enough for maps and searching for tourist spots.

•Frequent use of SNS, posting photos/videos:

•A medium capacity plan (10–15 GB) is recommended.

•Especially if you frequently upload photos and videos.

•Frequent use of video calls or streaming:

•A large capacity plan (25 GB or more) is necessary.

•If you plan to use YouTube, Netflix, etc.

Checking Device Type and Compatibility

•SIM-Free Devices: Most prepaid SIMs can be used without any problems.

•SIM-Locked Devices: Devices from carriers outside of Japan need to be checked before use. Ensure the SIM lock has been removed. If it is an eSIM-compatible device, a physical SIM card is not necessary.

•Network Compatibility: Check if the device supports the 3G/4G/LTE frequency bands used in Japan. Visitors from Europe or North America should be particularly careful.

Comparison with Other Communication Methods

Prepaid SIMs available at convenience stores offer the best balance for short- to medium-term foreign visitors in terms of ease and convenience. Generally, the larger the data capacity of the plan, the lower the unit price per GB tends to be.

Frequently Asked Questions (FAQ)

Q1: Is identity verification required at the time of purchase?

A: For data-only prepaid SIMs, identity verification or ID is generally not required. However, for SIMs with voice call functions, identity verification (presentation of a passport, etc.) is required by Japanese law.

Q2: Is a credit card necessary?

A: You can pay with cash when purchasing at a convenience store. Credit cards are also accepted at most stores. If you have difficulty preparing Japanese yen immediately after arrival, international brand cards such as VISA or Mastercard can be used.

Q3: Can I use the SIM card in my own smartphone?

A: It can generally be used if it is a SIM-free smartphone. However, if the device is SIM-locked, we recommend unlocking it before coming to Japan. You also need to check if the device supports the frequency bands used in Japan.

Q4: What happens after the usage period expires?

A: Once the set usage period (often 30 days) has passed, you will no longer be able to communicate. You cannot top up additional data, and you will need to purchase a new prepaid SIM. Please dispose of the SIM card after the usage period has expired.

Q5: Can I purchase one even if I don't understand Japanese?

A: Many convenience store staff understand basic English. It will go smoothly if you say "SIM card please" or use a translation app on your smartphone to show "I want to buy a prepaid SIM card."

Q6: I plan to visit multiple countries; can I use it outside of Japan?

A: Generally, it can only be used within Japan. Please note that unless it is a special SIM such as an Asia-wide plan, it cannot be used in other countries. If you plan to visit multiple countries, we recommend purchasing one in each country or considering a global SIM that supports multiple countries.

Q7: What is an eSIM? How is it different from a physical SIM card?

A: An eSIM is an electronic SIM that can be used without inserting a physical SIM card. It is convenient because it can be set up just by scanning a QR code, eliminating the need to swap SIM cards. However, compatible devices are limited to relatively new models, such as iPhone XS or later and Google Pixel 3 or later.

Q8: What is the internet speed?

A: Many prepaid SIMs available at convenience stores use the Docomo network, and in urban areas, you can expect average speeds of about 20–50 Mbps. However, this varies depending on the location, time of day, and network congestion.

Summary

Prepaid SIMs available at Japanese convenience stores are a convenient and easy communication method for foreign visitors. Especially for those staying for short to medium terms for tourism or business, the ability to start using them immediately without a contract is a major advantage.

Convenience stores are open 24 hours a day and have a nationwide network, making them the most accessible purchase locations for foreign visitors. Lawson, in particular, offers a wide variety of prepaid SIMs to meet the needs of travelers.

When traveling to Japan, purchasing a prepaid SIM at a convenience store immediately after arrival to secure a comfortable internet environment will enable smooth travel planning and information gathering. A convenience store prepaid SIM will be a powerful support tool to make your stay in Japan more convenient and comfortable.