3G mobile network
3G（第3世代移動通信） surī-jī
An older mobile generation used for voice and low-speed data. Japanese carriers have retired or scheduled the retirement of their 3G services.
A phone can look modern and still depend on 3G for calls if it lacks the carrier's compatible VoLTE implementation. After 3G closure, that phone may lose voice service even if some data bands work.
Check the exact model number, carrier compatibility list, VoLTE support, SIM and plan. DOCOMO ended FOMA on March 31, 2026; other carrier closure dates and migration measures differ.
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4G / LTE4G・LTE（第4世代移動通信）fō-jī / eru-tī-ī
The mature mobile generation that carries most everyday smartphone data and, with VoLTE, voice calls across broad coverage areas.
5G mobile network5G（第5世代移動通信）faibu-jī
The mobile generation designed for higher capacity, lower latency and many connected devices, deployed with several frequency bands and network architectures.
5G SA / Standalone5G SA（スタンドアローン）faibu-jī esu-ē
A 5G architecture using a 5G core network rather than relying on a 4G core and 4G control connection as non-standalone 5G does.
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An older broadband technology that sends data over a copper telephone line. Major Japanese consumer ADSL services have ended or are being retired.
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