Voice over LTE: Difference between revisions

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|archive-url=https://web.archive.org/web/20220121055206/https://www.itu.int/en/ITU-T/Workshops-and-Seminars/conformity-interoperability/20150112/Documents/Abstracts%20and%20Presentations/S3P5_Doug_Makishima.pdf |archive-date=21 Jan 2022 |format=PDF}}</ref> 4G/LTE Devices that lack native VoLTE calling support are reliant on 2G/3G Networks to make or receive calls (via Circuit Switched Fallback - CSFB). Without either 2G or 3G Networks, those devices do not have call service.

A device may be marketed as having VoLTE support. However, the device may only make calls on some networks due to varying network configurations and VoLTE standardization issues.<ref name="EENA2022">{{Cite web |author=@eena112 |title=EENA 2022: Access to emergency services is being impacted by the lack of VoLTE interoperability |url=https://www.youtube.com/watch?v=sHjyLmFt-eg |website=[[YouTube]] |date=31 May 2022 |access-date=30 Jul 2025 |url-status=live}}</ref>

A device may be marketed as having VoLTE support. However, the device may only make calls on some networks due to varying network configurations and VoLTE standardization issues.<ref name="EENA2022">{{Cite web |author=@eena112 |title=EENA 2022: Access to emergency services is being impacted by the lack of VoLTE interoperability |url=https://www.youtube.com/watch?v=sHjyLmFt-eg |website=[[YouTube]] |date=31 May 2022 |access-date=30 Jul 2025 |url-status=live |archive-url=https://preservetube.com/watch?v=sHjyLmFt-eg |archive-date=23 Feb 2026}}</ref>

In some instances, the retail versions of devices have been sold without VoLTE Calling on any networks (depending on brand/market/region). However, the exact same device purchased directly from a carrier (with carrier software) will support VoLTE on that carrier network.<ref name="HughVoLTE">{{Cite web |first=Hugh |last=Jeffreys |title=Carriers are Killing 4G & 3G Devices - Your 4G Phone May Soon Stop Working |url=https://www.youtube.com/watch?v=Q6qb9dml6So |website=[[YouTube]] |date=25 Nov 2023 |access-date=30 Jul 2025 |url-status=live}}</ref><ref>{{Cite web |first=Hugh

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 |archive-url=https://web.archive.org/web/20220121055206/https://www.itu.int/en/ITU-T/Workshops-and-Seminars/conformity-interoperability/20150112/Documents/Abstracts%20and%20Presentations/S3P5_Doug_Makishima.pdf |archive-date=21 Jan 2022 |format=PDF}}</ref> 4G/LTE Devices that lack native VoLTE calling support are reliant on 2G/3G Networks to make or receive calls (via Circuit Switched Fallback - CSFB). Without either 2G or 3G Networks, those devices do not have call service.
-A device may be marketed as having VoLTE support. However, the device may only make calls on some networks due to varying network configurations and VoLTE standardization issues.<ref name="EENA2022">{{Cite web |author=@eena112 |title=EENA 2022: Access to emergency services is being impacted by the lack of VoLTE interoperability |url=https://www.youtube.com/watch?v=sHjyLmFt-eg |website=[[YouTube]] |date=31 May 2022 |access-date=30 Jul 2025 |url-status=live}}</ref>
+A device may be marketed as having VoLTE support. However, the device may only make calls on some networks due to varying network configurations and VoLTE standardization issues.<ref name="EENA2022">{{Cite web |author=@eena112 |title=EENA 2022: Access to emergency services is being impacted by the lack of VoLTE interoperability |url=https://www.youtube.com/watch?v=sHjyLmFt-eg |website=[[YouTube]] |date=31 May 2022 |access-date=30 Jul 2025 |url-status=live |archive-url=https://preservetube.com/watch?v=sHjyLmFt-eg |archive-date=23 Feb 2026}}</ref>
 In some instances, the retail versions of devices have been sold without VoLTE Calling on any networks (depending on brand/market/region). However, the exact same device purchased directly from a carrier (with carrier software) will support VoLTE on that carrier network.<ref name="HughVoLTE">{{Cite web |first=Hugh |last=Jeffreys |title=Carriers are Killing 4G & 3G Devices - Your 4G Phone May Soon Stop Working |url=https://www.youtube.com/watch?v=Q6qb9dml6So |website=[[YouTube]] |date=25 Nov 2023 |access-date=30 Jul 2025 |url-status=live}}</ref><ref>{{Cite web |first=Hugh