NTT DoCoMo Speed Test | Kencang
Test your NTT DoCoMo internet speed in Japan
www.docomo.ne.jpNTT DoCoMo is Japan's largest mobile carrier with over 91 million subscribers. DoCoMo operates the country's most extensive 5G and 4G LTE network, covering all 47 prefectures. The company also offers fiber broadband through its docomo Hikari service built on the NTT FLET'S Hikari network.
About NTT DoCoMo
NTT DoCoMo was spun off from Nippon Telegraph and Telephone (NTT) in 1991 to handle mobile communications. The company pioneered mobile internet in Japan with its i-mode service in 1999, which became a global model for mobile data. DoCoMo holds roughly 50% of Japan's mobile market by subscriber count.
DoCoMo became a wholly owned subsidiary of NTT in 2020 after a tender offer valued at approximately JPY 4.3 trillion. The company is headquartered in the Sanno Park Tower in Chiyoda, Tokyo. It serves both consumer and enterprise markets across mobile, fiber, and content services.
In June 2025, DoCoMo replaced its eximo and irumo plans with a new lineup: docomo MAX, docomo Poikatsu MAX, docomo Poikatsu 20, and docomo mini. These plans bundle streaming services and offer larger discounts for family and d-card users.
NTT DoCoMo Plans and Services
NTT DoCoMo offers several internet plans across different technologies and price points.
DoCoMo's main mobile plan is ahamo, priced at JPY 2,970 per month for 20 GB of data with 5G access and 5-minute domestic calls. The ahamo Large option adds 80 GB for JPY 1,970 extra. For unlimited data, the docomo MAX plan costs JPY 7,315 per month before discounts and includes Amazon Prime, DAZN, and Lemino streaming.
For lighter users, docomo mini offers 4 GB or 10 GB tiers at lower prices. All plans support 5G Standalone and Sub-6 connections in covered areas. DoCoMo also operates docomo Hikari fiber broadband using the NTT FLET'S network, with 1 Gbps and 10 Gbps options available.
DoCoMo mobile customers receive a monthly discount of JPY 550-1,100 per line when bundling with docomo Hikari. The company also offers d-card payment discounts of up to JPY 550 per month on select plans.
NTT DoCoMo Internet Plans
| Plan | Speed | Price | Features |
|---|---|---|---|
| ahamo mobile | 5G/4G LTE | JPY 2,970/month |
|
| ahamo Large mobile | 5G/4G LTE | JPY 4,950/month |
|
| docomo MAX mobile | 5G/4G LTE | JPY 7,315/month |
|
| docomo Hikari 1 Giga (House) fiber | 1 Gbps | JPY 5,720/month |
|
Prices and availability may vary by location. Contact NTT DoCoMo for current offers.
NTT DoCoMo Coverage by Region
NTT DoCoMo performance varies by location. Coverage density, local infrastructure, and network congestion affect speeds in each market.
Tokyo Metropolitan Area
Best 5G performance area. Sub-6 and mmWave both available in select spots
Osaka-Kobe-Kyoto (Kansai)
Second priority 5G deployment area after Tokyo
Rural Prefectures (Tohoku, Shikoku)
4G remains the primary connection in most rural areas
Is NTT DoCoMo Right for You?
Every provider has trade-offs. Here is how NTT DoCoMo performs based on real-world usage and customer feedback.
Strengths
- Largest 5G coverage footprint in Japan, reaching all 47 prefectures
- Most subscribers of any Japanese carrier, ensuring strong network investment
- ahamo plan offers strong value at JPY 2,970 for 20 GB with 5G
- docomo Hikari bundle saves JPY 550-1,100 per mobile line per month
- First carrier to launch 5G in Japan in March 2020
- Strong d-point rewards ecosystem with retail and online partners
- Streaming services bundled with premium plans at no extra cost
Weaknesses
- Premium plans are expensive before discounts at JPY 7,315 per month
- 5G coverage outside major cities remains limited to select areas
- ahamo plan has no in-store support. Online-only customer service
- docomo Hikari shares NTT FLET'S infrastructure. Not a unique network
- Complex discount structure requires multiple conditions to get lowest price
Best For
- Users who want the widest 5G coverage in Japan
- Families that can stack mobile and fiber bundle discounts
- d-card holders who benefit from monthly payment discounts
- Budget users on ahamo who want 5G at JPY 2,970 per month
- Streaming fans who want Amazon, DAZN, and Lemino included
Not Ideal For
- Users who prefer in-store support (ahamo is online-only)
- Budget seekers. Rakuten Mobile offers unlimited data from JPY 3,278
- Users in rural areas where 5G is not yet available
- Those who want a non-NTT fiber network like NURO Hikari
How NTT DoCoMo Compares
Side-by-side comparison of NTT DoCoMo against major competitors in Japan.
| Competitor | Speed | Price | Coverage | Verdict |
|---|---|---|---|---|
| Au Kddi | DoCoMo and au deliver similar 5G speeds of 500-2,000 Mbps in optimal conditions. DoCoMo has wider 5G area coverage. | DoCoMo ahamo at JPY 2,970 for 20 GB. au similar plans around JPY 3,278-4,928. DoCoMo ahamo is slightly cheaper for online-only. | Both cover all of Japan with 4G. DoCoMo launched 5G first and has slightly more 5G base stations nationwide. | Choose DoCoMo for widest 5G coverage and the ahamo value plan. Choose au for Starlink direct satellite and au Hikari fiber bundles. |
| Softbank | Similar peak 5G speeds. SoftBank users report higher 5G availability time. DoCoMo has more 5G base station locations. | DoCoMo ahamo at JPY 2,970 for 20 GB. SoftBank LINEMO at JPY 2,728 for 20 GB. SoftBank's LINEMO is slightly cheaper. | Comparable 4G nationwide coverage. 5G coverage varies by city and area. | Choose DoCoMo for the largest subscriber base and d-point ecosystem. Choose SoftBank for SoftBank Hikari fiber bundles and PayPay rewards. |
Troubleshooting NTT DoCoMo Issues
Common NTT DoCoMo connection problems and how to fix them.
DoCoMo 5G speeds are slower than expected
Cause: Connected to Non-Standalone 5G instead of Standalone, or in a congested area.
- Check your phone settings to ensure 5G Standalone is enabled
- Move to an open outdoor area away from buildings and obstacles
- Toggle airplane mode on and off to reconnect to a different tower
- Restart the device to refresh network connections
- Check DoCoMo's network status page for maintenance in your area
docomo Hikari fiber speeds are much slower than 1 Gbps
Cause: Apartment (mansion type) connections share bandwidth among units. IPv4 PPPoE congestion during peak hours.
- Enable IPv6 IPoE (v6 Plus or transix) through your ISP settings
- Check if your router supports gigabit Ethernet and Wi-Fi 6
- Test with a wired Ethernet connection to rule out Wi-Fi issues
- Contact your ISP (not NTT) about switching to IPv6 IPoE if not already enabled
NTT DoCoMo History
Key milestones in NTT DoCoMo development and network expansion.
Spun off from NTT as NTT Mobile Communications Network
Launched i-mode mobile internet service, attracting 40 million users by 2005
Launched 3G FOMA network, the world's first commercial W-CDMA service
Started 4G LTE service under the Xi brand
Became first Japanese carrier to launch commercial 5G on March 25
Became wholly owned subsidiary of NTT after JPY 4.3 trillion tender offer
Launched ahamo online-only plan at JPY 2,970 for 20 GB
Replaced eximo and irumo with new docomo MAX plan lineup in June
Test Your NTT DoCoMo Speed
Run a free speed test to check if NTT DoCoMo delivers the speeds you are paying for. Test during peak evening hours for the most realistic results. Compare your results against NTT DoCoMo advertised speeds above.
NTT DoCoMo Speed Test FAQ
How fast is NTT DoCoMo 5G in Japan?
NTT DoCoMo 5G delivers download speeds of 500 to 2,000 Mbps in areas with strong Sub-6 coverage. In central Tokyo and Osaka, typical 5G speeds range from 300 to 800 Mbps during normal usage hours. Peak speeds on mmWave can reach up to 4.2 Gbps in optimal conditions. 4G LTE averages 50-200 Mbps depending on location and congestion. DoCoMo launched Standalone 5G and continues expanding coverage across all 47 prefectures.
What is the cheapest NTT DoCoMo plan in 2025?
The cheapest DoCoMo plan is ahamo at JPY 2,970 per month for 20 GB of 5G and 4G data. ahamo includes 5 minutes of free domestic calls per call. For even lower usage, docomo mini starts at a lower base price for users who need only 4 GB of data. ahamo is managed entirely online with no in-store support, which keeps the price lower than DoCoMo's full-service plans. Adding 80 GB to ahamo costs an extra JPY 1,970 per month.
Can I bundle DoCoMo mobile with fiber internet?
Yes. DoCoMo offers docomo Hikari fiber broadband that bundles with DoCoMo mobile plans for a discount of JPY 550 to 1,100 per mobile line per month. docomo Hikari uses the NTT FLET'S Hikari network and provides 1 Gbps speeds. The fiber plan costs JPY 5,720 per month for detached houses or JPY 4,400 per month for apartments. A 10 Gbps plan is also available in select areas. The mobile bundle discount applies to each eligible line on the same family group.