KDDI au - Japan

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KDDI au
Country
Japan Flag of Japan View country details


KDDI au (Japan) uses 8 LTE bands and 5 5G NR bands. Find out if your unlocked phone or mobile device will work with KDDI au (Japan). See the tables below for details.

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Carrier website: http://www.au.kddi.com/

Last updated: 2024/08/03 - See latest updates

KDDI au Japan is a leading mobile network provider in Japan, known for its high customer satisfaction rate. Here are some key points about the KDDI au Japan mobile network:

  1. Network Expansion and Reliability:

    • KDDI has expanded its service areas by setting up mobile phone base stations across Japan to provide a stable and reliable communications environment. This includes the deployment of 5G networks, which offer advanced telecommunications with low latency and high capacity.

  2. International Services:

    • KDDI offers international call services from mobile phones, fixed lines, and public phones, with no basic rates. Customers only pay for the calling time.
    • The company also provides Worldwide Data Flat services and voice services in over 160 countries and regions, allowing users to use their au smartphones and mobile phones securely and comfortably outside Japan.

  3. Home Phone Services:

    • The au HIKARI Phone service allows customers to install optical fiber communication cables at home, providing a high-speed internet connection.
    • The Cable-plus Phone service is a low-cost option provided through cooperation with cable television services.

  4. Customer Satisfaction and Support:

    • KDDI au has the highest customer satisfaction rate in Japan, attributed to its comprehensive services and support. The company offers Signal Support 24, an after-sales service for signal-related problems, where KDDI staff visit customers to improve signal quality using au Femtocells or au repeaters.

  5. Innovative Services:

    • KDDI has introduced various innovative services, such as the "LISMO" music service, which allows seamless connectivity between au mobile phones and computers, and "LISMO Video," which enables users to watch movies and TV dramas on both mobile phones and computers.

  6. Integration and Partnerships:

    • KDDI has integrated various services, including the "au one" portal for mobile phones and computers, and has partnered with other companies to enhance its offerings, such as the integration of UQ mobile services.

  7. Sustainability and Responsibility:

    • KDDI is committed to sustainability and responsible practices, including efforts to reduce environmental impact and improve customer satisfaction through initiatives like Signal Support 24.

Overall, KDDI au Japan offers a robust and reliable mobile network with a wide range of innovative services, ensuring a high level of customer satisfaction.

Frequency Bands

LTE

Name Interface Description
B1 (2100 MHz) LTE

KDDI au Japan uses LTE band B1 (2100 MHz). This band is part of the IMT (International Mobile Telecommunications) frequency band, which is commonly used for 4G LTE networks. The deployment of this band is not specified in the provided information.
B11 1500 MHz Lower LTE

KDDI au Japan uses LTE band B11, which operates at 1500 MHz. This band is part of the 1500 MHz (B11 & B21) exclusive bands in Japan, requiring special hardware dedicated to those bands. These bands are used by KDDI and Docomo, respectively, to support 6 of the 8 main LTE bands used in Japan.
B18 (800 MHz Lower) LTE

KDDI au Japan uses the LTE B18 (800 MHz Lower) frequency band. This band is part of the Platinum Bands, which are known for their ability to carry signals further and have good building penetration. The deployment of this band is not specified in the provided information.
B41 (TD 2500 MHz) LTE

KDDI au Japan uses the LTE band B41, which operates at 2500 MHz. This band is deployed nationwide and is used for high-volume traffic. It is also known as the TD 2500 MHz band.
B3 (1800 MHz +) LTE

KDDI au Japan uses LTE band B3 (1800 MHz +). This band was added to KDDI au Japan on August 3, 2024.
B26 (850 MHz +) LTE

KDDI au Japan uses LTE Band 26 (850 MHz +). This band was added to KDDI au Japan on August 3, 2024.
B28 (700 MHz APT) LTE

KDDI au Japan uses the LTE B28 (700 MHz APT) frequency band. This band operates between 703 MHz and 803 MHz, with the uplink ranging from 703 to 748 MHz and the downlink from 758 to 803 MHz. It supports channel bandwidths of 5, 10, 15, and 20 MHz and is known for its excellent propagation characteristics, allowing signals to penetrate buildings and cover larger geographic areas with less infrastructure. The band is widely used by public mobile operators for LTE network deployments and is particularly beneficial for wide area coverage and strong indoor penetration.
B42 (TD 3500 MHz) LTE

KDDI au Japan uses LTE Band 42 (TD 3500 MHz) for mobile services. This band supports various channel bandwidths, including 5, 10, 15, and 20 MHz, and is primarily used in the Asia-Pacific region. It is deployed to provide coverage in approximately 88.60 square kilometers at a signal strength of -100 dBm. The band is used for different aggregation scenarios, such as CA 42C (B42+B42), CA42D (B42+B42+B42), and CA_1A-42A (B1+B42).

Supported LTE Protocols

Name Generation
LTE 4G

5G NR

Name Interface Description
N18 (800 MHz) 5G NR

KDDI au Japan uses the 5G NR frequency band N18 (800 MHz) for its 5G services. This band is part of the company's broader 5G NR frequency band allocation, which includes other bands such as N28 (700 MHz), N77 (3700 MHz), N78 (3500 MHz), and N257 (28 GHz). The specific details about the deployment of this band are not provided.
N28 (700 MHz) 5G NR

KDDI au Japan uses the 5G NR N28 (700 MHz) frequency band. This band covers frequencies from 703 to 803 MHz and is commonly referred to as the APT 700 MHz band. It is a popular choice for 5G deployments due to its widespread availability and good propagation characteristics, which provide excellent coverage and building penetration. The band is used for both uplink and downlink communications, with specific frequency ranges allocated for each. KDDI has been actively deploying this band as part of its 5G network expansion, aiming to provide high-speed and high-capacity communications services across Japan.
N77 (3700 MHz) 5G NR

KDDI au Japan uses the 5G NR frequency band N77, which covers the 3700 MHz spectrum. This band is used for 5G services and supports high-capacity throughput. The deployment of this band is part of KDDI's efforts to expand its 5G network nationwide, aiming to provide advanced telecommunications services with low latency and high capacity.
N78 (3500 MHz) 5G NR

KDDI au Japan uses the 5G NR frequency band N78, which operates in the 3500 MHz range. This band is commonly referred to as the 3.5 GHz band. The deployment of this frequency band for 5G services began in Japan in 2020, as part of the country's efforts to roll out 5G services nationwide.
N257 (mmWave 28 GHz) 5G NR

KDDI au Japan uses the 5G NR band N257, which operates at a frequency of 28 GHz (mmWave). This band is part of KDDI's 5G network, which includes various frequency bands for different purposes. The 28 GHz band is known for its high-frequency characteristics, which allow for high-speed data transfer but have limited range and penetration capabilities, making it suitable for hotspot deployments in high-traffic areas such as large stations and downtown areas in major cities.

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