Japan Voice Over LTE (VoLTE) and Voice Over Wi-Fi (VoWi-Fi) Market

Japan VoLTE and VoWi-Fi Market Size and Industry Outlook Forecast from 2025 to 2035

The increasing penetration of smartphones and IP-based voice communication technologies like Voice Over LTE and Voice Over Wi-Fi in Japan are expected to experience large growth in demand over the next 10 years. The shift towards to withdraw 3G telecommunications networks, VoLTE is gaining as the primary voice technology such as high-definition, voice quality, reduced call setup times and increased reliability.

The stage of VoWiFi is undergoing a rapid-growth phase propel due to the demand for indoor connectivity solutions, as well as seamless handovers between networks. The funnel of Wi-Fi 6 and Private 5 G networks is also empowering VoWiFi offerings to ensure decreasing price, high-quality voice calls. The market is expected to exceed USD 1,456.7 million by 2025, with a CAGR of 25.1%, exceeding USD 13,675.9 million by 2035.

Market Attributes and Growth Projections

Attributes	Values (USD Million)
Estimated Market Size in 2025	USD 1,456.7 Million
Projected Market Size in 2035	USD 13,675.9 Million
Value-based CAGR from 2025 to 2035	25.1%

Semi-Annual Market Update on Japan’s VoLTE and VoWi-Fi Adoption Trends

The table below outlines the semi-annual growth rate of the market, offering insights into industry trends.

Particular	Value CAGR
H1 2024	24.2%
H2 2024	24.7%
H1 2025	24.8%
H2 2025	25.4%

The market in Japan for voice over long-term evolution (VoLTE) and voice over wireless fidelity (VoWi-Fi) services is expanding. H2 2024 data was then based on higher enterprise adoption of VoWiFi solutions, helping spur growth from H1 2024 (24.2%) to H2 2024 (24.7%). This pattern remained in H1 2025 (24.8%). and H2 2025 (25.4%), promting advanced network infrastructure, and integration in 5G.

Recent Developments in the Japanese VoLTE and VoWi-Fi Network Ecosystem

Date	Development / M&A Activity & Details
Jan-25	NTT Docomo expands VoLTE and VoWi-Fi capabilities to enhance indoor call quality.
Oct-24	SoftBank partners with cloud VoIP providers to improve enterprise VoWi-Fi solutions.
Mar-24	KDDI launches AI-powered call optimization for VoLTE and VoWi-Fi services.
Sep-24	Sony integrates advanced VoWi-Fi features in its latest smartphone lineup, boosting call reliability.
Dec-23	Japan’s MIC allocates new spectrum to support rising VoWi-Fi adoption in urban and rural areas.

Key Industry Highlights of Japan’s VoLTE and VoWi-Fi Rollout and Coverage Expansion

Increasing Adoption of 5G-Enabled VoLTE Services

The rising installation of 5G network is the key element that is propelling the growth for global voice over LTE market due to telecom operators are putting effort on 5G Network infrastructure. The rollout of 5G has also surpassed the 2G and 3G networks, which mobile operators are phasing out as a way to pave the way for 4G and 5G VoLTE, which will enable VoNR (Voice over New Radio) and real-time video calling.

Meanwhile, VoLTE adoption is accelerating in countries like Japan, South Korea, and China as 5G coverage expands in the regions. New cloud-native IMS (IP Multimedia Subsystem) solutions continue to innovate on VoLTE scalability, operational cost optimization, and service reliability.

Expansion of Wi-Fi Calling for Indoor Connectivity

VoWiFi is becoming an essential solution for voice calls indoors, especially with the rise of Wi-Fi 6 and private 5G networks. Operators then are incorporating Wi-Fi calling to help cover low-signal areas, like office buildings, underground metro stations, and rural places.

Voice over Wi-Fi, also commonly known as VoWiFi, allows your mobile device to transmit its voice calls over a Wi-Fi network, meaning you no longer need a cellular signal to make a voice call. Carrier-grade WiFi solutions are also essentially utilized by enterprises, offering a cost-effective mode of communication between internal departments, as well those employed to boost the overall user experiences.

Rising Demand for High-Quality Voice Communication

HD voice calling and an improved call quality is being demanded by consumers and businesses resulting in an increasing demand for VoLTE and VoWiFi solutions. Traditional circuit switched network have poor clarity, latency and call drop.

VoLTE and VoWiFi, which are based on packet switched technology, offer low-latency, high-definition audio and less background noise as compared to earlier generations of networks. VoWiFi also acts like a cheap international roaming plan, letting users call a local number while travelling (again, at local rates) and avoiding expensive international calls.

Expansion of IoT and Smart Devices with Voice Capabilities

Smartphones, wearables, IoT-enabled devices and smart assistants are shifting the demand for VoLTE and VoWiFi connectivity. Telecom providers are focused on developing a VoLTE-supported IoT ecosystem to meet consumer demand for voice integration across multiple devices. VoLTE and VoWiFi obtain substantial significance in real-time processing and low power consumption for such applications such as connected cars, smart assistants and industrial automation where voice communication will be highly reliable.

Japan VoLTE and VoWi-Fi Market by Technology Type, Operator Model, Subscriber Base, Device Category, and Region

By Technology

Technology	Market Share (2025)
Voice over LTE (VoLTE)	62.0%
Others	38.0%

The expansion of 5G networks, upgrades of existing networks, and the phased-out era of 3G, VoLTE is dominating. Telecom companies prioritize VoLTE interface for incredibly high voice quality, zero latency calls, and video calling.

By Device Type

Device Type	Market Share (2025)
Smartphones	70.0%
Others	30.0%

Smartphones are dominating the market due to the growing adoption of 5G, the availability of better VoLTE-enabled devices and the increasing need for HD voice services.

Market Concentration and Competitive Landscape Across VoLTE and VoWi-Fi Providers in Japan

The Japanese VoLTE and VoWi-Fi market is highly competitive with the leading giants of telecom operators and technology firms are propelling the innovation.

Vendors	Market Share (2025)
NTT Docomo	35.0%
Soft Bank	28.0%
KDDI	22.0%
Sony	7.0%
Others	8.0%

Top Segments Studied in the Japan VoLTE and VoWi-Fi Market: Technology, Network Type, Device, End User, and Region

By Technology:

• LTE Voice
• Voice Over Wi-Fi.

By Device Type:

• Smartphones
• Tablets
• Laptops
• Wearables
• IoT Devices.

By Application:

• Consumer Communication
• Enterprise Communication
• Unified Communication Platforms.