When is VoLTE support expected?

You mean there are networks which work on 4G+ VoLTE only and we can't make any call without a compatible phone? No possibility to have a feature phone at all?

@Sthocs I don't know about other networks, but Reliance JIO is a 4G only network. So, it can't switch to other network when a call is needed, hence the need for VoLTE. Ofcourse, Android user can make calls in this network using the apps provided by Reliance JIO (MyJIO etc..). But, I'm not sure if it works on Jolla since Anroid apps don't have direct access to sim card hence the problem.

@Sthocs - Yes, no feature phone support yet on these 4g only networks. And yes, some service providers are 4g + VoLTE only. According to the wikipedia article I linked above, SEATEL in Cambodia is also a 4g only network without 2g or 3g.

Interesting, thanks for the info guys

What exactly is the major advantage of VoLTE for me, the user? AMR-WB is also supported on 3G, and works just fine on Jolla1. AFAIC, VoLTE really isn't a "basic phone feature" just yet. And I wonder if it even qualifies as "nice to have". From my European viewpoint, I really don't care about some 4G-only networks. I reckon Qualcomm wants a hefty, if not absurd, financial compensation before they hand over the needed drivers/documentation. I'd rather have Jolla spend it on VoIP, than on VoLTE.

Interview with Nokia Networks in Sweden . Seems like 2015 is the year that VoLTE will be started. More info is expected at MWC in less than month. Tele2 Sweden officially states that they will start VoLTE this year. The article further states that VoLTE already has been rolled out in Hong Kong (CSK, 3, PCCW, Smartone), South Korea (SK Telecom, KT), Japan (Docomo), and Telenor Danmank. AT&T and Verizon har started in some countries where they own a network.

That topic clarified that VoLTE feature is not present in Sailfish OS. This topic is seeking clarification when VoLTE support will be added to Sailfish OS by Jolla.

@sifartech well this answer is almost two years old, and in the answer from Jolla in the topic I linked, you can see they actually also present an answer to when; "not anytime soon". So my answer was not so out line - at the time. Nevertheless, soon has passed many times since then, and the question when is now relevant as more and more VoLTE services are started.

@nick75 - Oh yeah, I understand. I actually added that comment for the new members.

Along many other things, VoLTE should be a top priority these days. Would be nice to get an ETA from Jolla on this matter.

Developers, Developers, Developers.

is there any one who can help by creating a 3rd party app?

As VoLTE is very carrier specific ask your carrier to provide an application for SailfishOS.

We (SailfishOs Users) can Expect Volte Support Very Soon as Increasing Demands for Volte will Force Jolla from Partners Side and Which Manufacturer will bet fot 4G devices without Volte

but jolla have partnered with very few manufactured, as a matter of fact I have heard only intex till now. And intex is certainly not going to force sailfish to provide update.But lets hope

DC i have been using Voice over IP for ages, or Voice over Mobile Data (including 2G, 3G, 4G and LTE) and it mostly works.

Here are the apps to make it happen so you dont have to wait for carriers to get off their seat: 1. TalkU 2. Talkatone

I find most reliable for local and international calling and messaging at low rates.

@DarkTurning actually calling and messaging is completely free Reliance jio. This is the reason everyone asking for Volte support here in India. People have option to buy new phone through savings on calling plans in Reliance Jio as compared to other service provider. I have contacted the service provider but yet to recieve no from them. They have to bring new app registration process to support Aqua fish. I dont think they will do that. Every other OEM providing volte support as mandatory feature.

If Jio4Gvoice would have working by verifying Sms on sim then it can work, but the app detects sim physically, even in 2G android phone

I also request (actually, I demand) that Jolla C and further devices support DAB! 510+ million europeans will have to change from FM to DAB in the next years!! (/irony)

Unfortunately I agree. In EU T-Mobile and Orange already provides VoLTE also, I would say on regular basis, and offers for users even free calling and free internet as they are still testing network and technology. Anyway, seems VoLTE is still not in Jolla radar of current issues. From one hand I can understand as in fact there is not established clear path to follow so VoLTE in different countries and even at different operator can mean different things, considering internal standards used by operators. On the other hand VoLTE is already in operator's plans, advertised, and some use it like 2G or 3G. Especially it is confusing when operators like T-Mobile or Orange offers free use in return of reporting noticed problems and "accepting the network so phone calls can not work as expected or not quite properly e.g. can happen disconnected calls. VoLTE is unavoidable option for SailfishOS I think. The only question is when, sooner or later?.

"no plans" to support it and "no plans to be announced" leaves it a little open to interpretation. They may have plans to support this feature - but not to be announced yet as it may be too far down the road, or priorities may likely change.

I never said "never". ;-) Those are my last information and I wanted to share it.

Also the official Jolla twitter account mentions:

We have no plans to add VoLTE to Sailfish OS yet.

Source: https://twitter.com/JollaHQ/status/814411736916828160