Truly Useful Budget Smartphone Ranking 2026 Edition ～Carefully Selected with 6 Verification Points～

For people who use WiFi at home and only check social media or browse the internet when out, a data capacity of around 5GB per month is often sufficient. If you choose a truly affordable smartphone plan, you can significantly reduce your monthly costs compared to major carriers. However, with many services like LinksMate, y.u mobile, and mineo available, and questions such as “What’s the difference between MVNO and MNO?” or “What can I do with 5GB?”, many people may feel confused when choosing.

This time, we examine 20 popular affordable smartphones with 5GB monthly plans across six key points. We define a truly usable budget smartphone as one that offers fast communication speeds at any time of day, reliable communication quality, and affordability when using 5GB per month. We present our carefully selected services in a ranking format.

Conditions for a Truly Usable Budget Smartphone — Six Key Points of Evaluation

To find a truly usable budget smartphone, we thoroughly evaluated each service based on these six points:

1. Communication Speed — Measured actual speeds during morning, noon, and night
2. Signal Stability — Connection reliability indoors and underground
3. Monthly Cost at 5GB Usage — Actual comparison of monthly fees
4. Initial Costs — Administrative fees and SIM issuance charges
5. Usability After Data Is Used Up — Practicality of low-speed mode and optional features
6. Ease of Switching — MNP support, eSIM compatibility, etc.

【Selected】Top 3 Truly Usable Budget Smartphones — Balance of Speed and Cost

1st Place: LinksMate (LogicLinks) — A Strong Ally for Gamers and Video Users

Overall Score: 4.7/5.0

If you frequently use gaming apps, streaming services, or social media, LinksMate is a top choice. It’s highly rated as a truly usable budget smartphone because it offers a reasonable 1,210 yen monthly plan for 5GB and maintains stable communication speeds.

Although it’s an MVNO that leases lines from Docomo, it maintains high speeds even during lunch breaks and commuting hours, allowing high-quality videos to stream smoothly. Many MVNOs slow down during congestion, but LinksMate remains robust.

Its biggest feature is the “Count-Free Option” (550 yen/month), which reduces data consumption to 1/10 for targeted services like U-NEXT and gaming apps, making it ideal for heavy video and gaming users. However, it does not support MNP one-stop procedures, so switching can be somewhat cumbersome.

Pros

• Reliable speed stability + count-free option for games and videos
• Minimal initial cost: only 550 yen SIM issuance fee
• eSIM compatible, no need to swap SIMs

Cons

• No MNP one-stop support
• Count-free option adds 1,760 yen, slightly increasing cost

2nd Place: y.u mobile — Unlimited Data Rollovers, Zero Waste

Overall Score: 4.62/5.0

At just 1,070 yen for 5GB, y.u mobile offers industry-leading affordability. For those prioritizing “cost performance” in a truly usable budget plan, y.u mobile is recommended.

Its biggest advantage is “permanent data rollover.” If you live in a WiFi environment or tend to have leftover data each month, you can carry over unused gigabytes indefinitely. It’s an MVNO that leases lines from Docomo, and speeds during congestion are high enough to watch high-quality videos.

However, the initial cost is relatively high at 3,740 yen, and it does not support MNP one-stop or eSIM, which can be inconvenient. Still, long-term users can recover the initial cost through monthly savings.

Pros

• Truly affordable: 1,070 yen/month, among the cheapest
• Unused data can be rolled over permanently
• Speed during congestion is acceptable

Cons

• Initial fee of 3,740 yen is high
• Switching procedures are cumbersome (no MNP one-stop)

3rd Place: mineo (Optage) — Flexible Line Selection with 3 Carriers

Overall Score: 4.59/5.0

If flexible carrier choice is important, mineo is the best option. It allows selection among Docomo, au, and SoftBank lines. Using the same line as your current carrier makes area coverage and switching smoother.

Despite being an MVNO, it offers stable speeds that support high-quality video streaming even during busy hours. Signal stability indoors and underground is good. The 5GB plan costs 1,518 yen, which is reasonable.

It supports MNP one-stop, simplifying switching procedures. For non-SoftBank lines, eSIM support is available, eliminating the need to swap SIM cards. Also, in-store support at nationwide mineo shops makes it friendly for those unfamiliar with digital procedures.

Pros

• Choose from 3 carriers freely
• MNP one-stop makes switching easy
• Balances speed and signal stability
• In-store support available

Cons

• Initial fee of 3,740 yen (including 3,300 yen admin fee + 440 yen SIM fee)

Other Recommended Truly Usable Budget Smartphones

IIJmio — The Cheapest at 950 Yen/Month

At 950 yen for 5GB, it’s among the lowest. It offers a wide selection of devices for purchase. However, speeds tend to drop significantly during lunchtime, which can affect stability. MNP one-stop support makes switching smooth.

HIS Mobile — 7GB for 990 Yen, Great Value

No 5GB plan, but 7GB at 990 yen is very affordable. Operated by a travel agency, it offers benefits like HIS travel discounts and overseas SIMs. Be aware of speed fluctuations during certain times. MNP one-stop support starts from November 2024.

BIC SIM — 950 Yen + Point Rewards

BIC SIM users can get the 5GB plan for 950 yen, paying with BIC points. Support is available at BIC stores nationwide. However, speed drops during lunch hours are notable.

Japan Communications SIM — Flexible Usage with Pay-As-You-Go

At 1,170 yen for 5GB, it offers a pay-as-you-go plan with per-GB upper limits to prevent overuse. MNP one-stop support is available. Speed may slow during congestion, as with all MVNOs.

LINEMO (SoftBank) — For Speed Enthusiasts

Though more expensive at 2,090 yen/month, it uses SoftBank’s high-speed network exclusively. LINE Giga Free offers zero data consumption for LINE apps. If stability and speed are your priorities, it’s an excellent choice. Supports MNP one-stop and eSIM.

How to Choose a Truly Usable Budget Smartphone — Which Type Are You?

Service Recommendations by Type

▶ Price Priority → y.u mobile (1,070 yen) or IIJmio/BIC SIM (950 yen)

▶ Speed Priority → LinksMate (high stability) or LINEMO (fastest MNO)

▶ Gaming/Video Users → LinksMate (count-free, 1/10 compression)

▶ First-time Switchers → mineo (3-carrier support + in-store support) or AEON Mobile (apply at AEON stores)

▶ Want to Roll Over Data → y.u mobile (permanent rollover)

FAQs

Q: How does the cost of a truly usable budget smartphone compare to major carriers?
A: For 5GB/month, major carriers charge around 7,000–8,000 yen; a truly usable budget plan can be around 1,000–2,000 yen, saving over 5,000 yen monthly.

Q: What’s the difference between MVNO and MNO?
A: MVNO (Mobile Virtual Network Operator) leases lines from major carriers, which can lead to speed drops during congestion. MNO (Mobile Network Operator) owns its lines, ensuring more stable quality.

Q: What can I do with 5GB?
A: About 12 hours of standard-quality video streaming, plus unlimited use of SNS, email, LINE, etc.

Q: Is switching complicated?
A: With MNP one-stop services, you only need to apply at the new provider; no need to handle procedures with your current carrier, making it simple even for beginners.

Choosing a truly usable budget smartphone isn’t just about comparing prices; it involves considering communication quality, ease of switching, and your usage patterns. Use this ranking as a guide to find the best fit for your needs.