I find myself wondering if the Librem 5 will ever support WiFi calling, also known as “GAN” or “UMA” according to Wikipedia. Most new phones seem to support this.
For those who don’t know, WiFi calling essentially replaces the cellular radio link with a tunnel into your carrier’s network over WiFi and the Internet, in situations when you have WiFi but no or poor cellular coverage. You can use it to make and receive calls and to send and receive SMS and MMS messages, which are billed to your normal account using your normal number.
Does anyone have any idea about what it would take to support WiFi calling, and how likely or unlikely it is for the Librem 5 to ever support it? For example, does it require any binary blobs or non-disclosure agreements, or just open standards and access to the SIM? Does it require tight coupling between the WiFi, CPU and baseband, or can it be done with the Librem design? Has the Purism team looked into it at all?
I suppose it might be related, in terms of how it works, to VoLTE, which I guess prompts a different question about whether that will be possible to support.
Of course, the Librem 5 will be able to use Matrix for VoIP, but that covers slightly different use cases compared to WiFi calling.
For me, this is a “nice to have” rather than a necessity, but it is something that I would probably make use of, given the extent to which buildings often interfere with signals.