Unveiling the Internet Speeds of 23 Budget SIM Providers in Japan

Unveiling the Internet Speeds of 23 Budget SIM Providers

Showcase, a Tokyo-based company specializing in digital transformation cloud services, has conducted an in-depth measurement of internet speeds for 23 budget SIM providers through its price comparison platform, Showcase Plus Budget SIM. In the digital age, the speed of mobile internet can significantly affect user satisfaction, especially during busy times like lunch and evening hours when network congestion often occurs.

Overview of the Study

The importance of speed in budget SIM services cannot be understated; users can experience significant delays even with lower rates. The Showcase Plus Budget SIM team undertook a detailed examination of internet speeds for the most prominent budget SIM operators, which included prepaid and postpaid plans from major carriers. The study, which spanned the period from July to October 2025, was conducted with a focus on identifying these troublesome moments.

Unique Measurement Methodology

- Subjects: 23 major budget SIM operators, including carrier-offered mobile plans.
- Measurement Period: July to October 2025.
- Devices Used: iPhone 16e for testing.
- Test Locations: Three areas in the Tokyo vicinity, specifically Kanagawa Prefecture's Tama Ward, and Tokyo's Shinagawa and Sumida wards.
- Test Timeframes: Measurements were performed during peak times; lunch hours (12 PM - 1 PM) and evening (5 PM - 6 PM)
- Metrics Recorded: Three crucial metrics were captured:

1. Download Speed: The most critical factor affecting loading times.
2. Upload Speed: Essential for sending data.
3. Ping Rate: Affected by latency, especially for gaming.

Highlights of the Results

The findings of this independent study are presented in an easily comprehensible format, allowing users to make informed decisions about which budget SIM to choose based on their internet speed needs.

The results are color-coded to easily identify the top performers in download speed:

- 1st Place: Red
- 2nd Place: Orange
- 3rd Place: Yellow

Among the 23 companies evaluated, detailed results for providers such as Rakuten Mobile, ahamo, povo, LINEMO, Ymobile, and UQ Mobile are disclosed, organized by location and time of measurement.

For the complete data and analysis results, readers can refer to the following URL:
Comprehensive Results of Internet Speeds for 23 Budget SIM Providers

Future Directions of Showcase

Showcase continues to strive for excellence in connecting businesses and customers through beneficial information dissemination, while enhancing its media operations and analytical studies.

For more details on budget SIM comparisons, visit the Showcase Plus Budget SIM site:
Showcase Plus Budget SIM Website

About Showcase

Showcase, founded in February 1996, operates from Roppongi First Building, Tokyo, under the leadership of CEO Junichi Hirano. Listed on the Tokyo Stock Exchange's Standard Market (Ticker: 3909), the company focuses on removing user disadvantages through advanced technology, thus enhancing their overall happiness. The ultimate goal of Showcase is to exceed expectations, leading to user satisfaction through a framework focused on technological solutions.