Done! Thanks for reminding me!
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Sailfish OS Version: 5.0.0.29
SIM provider and country: O2 Telefonica, DE
Network provider and country (if roaming): n/a
Number of SIM cards in use and in which slot: 1 / 1 & 2
| Country | Provider | Registered | Voice in | Voice out | SMS in | SMS out | MMS in | MMS out | Compared |
|---|---|---|---|---|---|---|---|---|---|
| DE | O2 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
I am really impressed with how robust the VoLTE service is.
My first surprise was the dial tone on call, which is a great improvement over the implementation on my Sony Xperia 10III. Sending text messages also works flawlessly, which was also not the case with the Xperia 10 III.
Sending and recieving MMS from Xperia 10 III (on SFOS 4.6.0.15) to the C2 and vice versa was successful.
In addition to the documented test cases, I also successfully held a call and started a new call at the same time. However, it was not possible to start a three-way conference. (The active connection went silent and the inactive connection remained on hold)
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In 5.0.0.43 release SI Bob SIM does register but Hot still doesn’t. Wiki updated. More tests follow.
5.0.0.43:
| Country | Provider | Registered | Voice in | Voice out | SMS in | SMS out | MMS in | MMS out | Compared |
|---|---|---|---|---|---|---|---|---|---|
| DK | 3 | ✓ | x | ✓ | ✓ | ✓ | x | x | |
| DK | Yousee | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
On my 10iii VoLte problems is almost reversed, except from MMS things work on 3’s network, but calls in and sms out does not work on Yousee network.
Please edit the first post with your info.
I have this ‘backup’ SIM from Swedish provider WiFog (Tre) where VoLTE doesn’t work at all.
Let me know if I can do something to fix it.
Here’s some screens from the NetMon VoLTE app.
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Roaming in Croatia works. ( network 219-2 )
That is, mobile data works, VoLTE does not register.
Calling (2G/3G) works.
SMS does not work.
Even with a ‘Sign in to network’ via Captive Portal browser, where my provider wants me to select a roaming plan.
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Please fill the first post Wiki table.
Sailfish OS version: 5.0.0.43
SIM provider and country: Blau.de, DE (Telefonica)
Network provider and country (if roaming): -
Number of SIM cards in use and in which slot: 1 / 1
| Country | Provider | Registered | Voice in | Voice out | SMS in | SMS out | MMS in | MMS out | Compared |
|---|---|---|---|---|---|---|---|---|---|
| DE | Blau | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ? |
Jolla C2 use the “o2 - de”-Profile
Edit: I filled this to the first post of Wiki table.
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What does “Not Registered” means in Settings? And selecton button is blinking.
It means VoLTE doesn’t work.
Please add test info in first post so it’s not buried this deep.
It can. Directly. Don’t use it’s installer yet.
One more finding: SMS stopped working. Switching to <= 3G did not work. Flight mode and back did not work. Restart worked.
| FR | orange Pro; | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | Voice |
| FR | Auchan Telecom; | ✕ | ✓ | ✓ | ✓ | ✓ | ✓ |✕ | Voice
| FR | Coriolis | ✓ | ✓ | ✕ | ✓ | ✕ | ✓ |✕ | Voice
Cannot send or receive MMS messages
Country : Fr
Provider : CDiscount mobile (Bouygue telecom network)
Sim slot : 1
Phone : Jolla C2
OS : 5.0.0.43
SMS reception is ok but sending is very long.
Country : Fr
Provider : CDiscount mobile (Bouygue telecom network)
Sim slot : 1
Phone : Jolla C2
OS : 5.0.0.43
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Is there anything we/ i can do or try to make volte working? Or any commands that might show why its failing?
On my 10ii it is currently working but on the c2 it fails to register 
Provider: DE congstar (telecom network)
Country : IT
Provider : Iliad
Sim slot : 1
Phone : Jolla C2
OS : 5.0.0.43
SMS works
Cannot send or receive MMS messages (checked twice the server center address is mms.iliad.it)
4G data transfer is stable but slow
4G VoLTE stays in registering and does not work
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This can work, but not in automatic mode/selection. On my C2 (5.0.0.43), this solution work : MMS setting for Bouygues Telecom and co (Fr)