Easily get a prepaid SIM at convenience stores! Comprehensive review guide of 15 products for different uses

No verification of identity or credit card is required, and anyone can easily use this prepaid SIM. Its attractive feature is the pay-as-you-go system, but there are various ways to obtain it—from products available at convenience stores to online-only options. Depending on your situation—“I need it immediately,” “I want the cheapest option,” “I care about fast communication speeds”—the best choice varies greatly.

In reality, many services such as HIS Mobile, IIJmio, and PrepaidSim.com are available in the market, making it confusing to choose which prepaid SIM to get. This article tests 15 popular prepaid SIMs and provides a user-specific guide to help you select the most suitable one.

Prepaid SIMs Available Immediately at Convenience Stores — Prioritizing Convenience

For urgent needs like “I need it for tomorrow’s business trip” or “I want to use it right now,” buying at a convenience store is the best option. While the selection of prepaid SIMs at Lawson, Mini Stop, 7-Eleven, and others is limited, the major advantage is that you can start using it on the same day.

IIJmio JAPAN TRAVEL SIM (Internet Initiative) stands out as the only product among tested options that can be purchased at convenience stores, drugstores, and Don Quijote. It uses Docomo network and offers a wide range of data options from 3GB to 55GB. Choosing the eSIM version allows registration in as little as 5-10 minutes, enabling you to start using it immediately after purchase.

However, the price tends to be higher—10GB costs 3,280 yen, and 50GB costs 5,780 yen—making it more expensive compared to online-only products. Speed tests showed significant slowdown during daytime in suburban areas, so it may not be suitable for users who require consistent performance regardless of time.

Nevertheless, if convenience and immediate availability are your top priorities, this service is the first choice.

Choosing a Prepaid SIM by Cost — For Cost-Performance Focused Users

For those who want to minimize initial investment and use the service as cheaply as possible, several competitively priced options are available.

HIS Mobile Prepaid SIM offers unlimited data for 30 days at an unbeatable price of 3,512 yen. It uses Docomo network, allowing unlimited usage without worrying about capacity. Even for six months with 30GB, the cost is 4,846 yen, appealing to long-term users. While speeds may decrease during daytime in urban areas, speeds are generally sufficient for browsing websites and watching standard-quality videos during other times. Ideal for cost-conscious daily use.

JAPAN PREPAID SIM (Parrot Bee) also has excellent pricing. Utilizing SoftBank’s direct network (not MVNO), it offers stable performance with 10GB at 2,380 yen and 30GB at 4,480 yen. 50GB costs 6,480 yen but remains competitive for short- to medium-term use.

On the other hand, DXHUB “JAPAN PREPAID SIM CARD” is the cheapest at 2,780 yen for 10GB, but speeds are below 10 Mbps at all times, and even email reception can be slow. Suitable only for limited needs like occasional use or checking emails.

Choosing a Prepaid SIM for Speed Stability — For Those Who Prioritize Communication Quality

If you frequently stream videos, use SNS, or rely heavily on data, speed stability is crucial.

Prepaid SIM.com SIM Card (Mobile Planning) offers 50GB for 4,580 yen over 31 days, with speeds exceeding 170 Mbps in urban areas during evening and night hours. Even in suburban areas, stable speeds are expected after midday, making it suitable for streaming. It can be set up easily via APN without Wi-Fi.

calendar-world “CALENDAR 1-Year Prepaid SIM” is a 5G-compatible product using Rakuten network. At 3GB/month for 6,060 yen annually, it provides stable high-speed connectivity at all times, suitable for long-term use with gadgets.

JAPAN PREPAID SIM (Parrot Bee) also performs well across different times and locations, leveraging SoftBank’s direct network for superior speed maintenance during congestion.

Long-term Use Prepaid SIM — For Sub-Gadget Users

If you plan to use the SIM in tablets, mobile Wi-Fi routers, or as a backup device, monthly cost and total expense matter.

Calendar-world products are valid for 12 months; for example, 3GB/month costs 6,060 yen annually, offering peace of mind with low risk of loss and unused capacity.

HUAWEI-minwifi SIM card (Micro Innovation) costs about 6,120 yen per year for 3GB/month. It’s easy to use—just insert and start, with SMS support for LINE verification, making it convenient for long-term, low-frequency use.

These options are suitable for users who “don’t use it often but want always-on connectivity.”

Four Essential Checks When Choosing a Prepaid SIM

Based on actual tests, here are key factors to consider:

Point 1: Confirm Pricing Structure
Compare prices based on your expected data usage—50GB packages, 10-30GB tiers, or monthly costs. Products available at convenience stores tend to be more expensive, so decide if the convenience premium is acceptable.

Point 2: Practicality of Acquisition Method
Online-only products often have lower prices but require waiting for delivery. If you need it immediately, convenience store purchase or eSIM options are more practical.

Point 3: Speed Variations by Time of Day
Many products experience significant speed drops during daytime in urban areas. Prioritize stability during your main usage hours to avoid regrets.

Point 4: Ease of Setup
Consider whether setup involves APN configuration, Wi-Fi connection, or phone activation. For less hassle, choose “plug-and-play” types that require just inserting the SIM.

By adjusting the importance of these four factors according to your usage scenario, budget, and priorities, you can select the most suitable prepaid SIM.