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)
For SMS and call voice, i resolved my problems : Network settings for SMS and voice calls for Bouygues Télécom and co (Fr)
Still not working on 5.0.0.55 for german congstar (telekom) 
UPDATE: Provider Hot on A1 network has only recently started to enable LTE despite A1 long history with LTE.
Sending MMS is the only thing that doesn’t work. Will test again after 5.0.0.55 upgrade.
Still need to test Bob on native A1 network.
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Austria
HOT
slot 1
C2
5.0.0.55
phone in / out works
sms in / out works
mms sending: (failed) works after settings update
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Isn’t hot t-mobile? Yesss is A1. Hot has Eu tarrifs in UK, only t-mobile still has this. (at least last summer) VoLTE works with A1.
Bob should work, it’s A1.
Well, not in Slovenia.
in austria yes nowadays
@filipk Oh, sorry. My bad.
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Everything else seems to be working with VoLTE as intended except receiving RCS messages. Tampella 5.0.0.55 and Telia (Fi) as provider. If sender has rcs enabled from SMS-settings they’ll have notification about me being offline and I will not get any notification unless I move my SIM card to Android phone.
Jolla C2 at 5.0.0.55
All C2 SIMs are PAYG
All SIMs in SIM1 - no SIM in SIM2
Netmon VoLTE
| Country | Provider | Connection Icon | Registered | Registration | Sms Capable | Voice Capable |
|---|---|---|---|---|---|---|
| UK | EE | 4G | ✓ | auto | x | ✓ |
| UK | O2 | 4G | ✓ | auto | x | x |
| UK | Three | 4G | ✓ | auto | x | ✓ |
| UK | Vodafone | 4G | ✓ | auto | x | ✓ |
| Country | Provider | Registered | Voice in | Voice out | SMS in | SMS out | MMS in | MMS out | Compared |
|---|---|---|---|---|---|---|---|---|---|
| UK | EE | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ? |
| UK | O2 A | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | x | ? |
| UK | Three | ✓ | ✓ | ✓ | ✓ | ✓ | x | x | ? |
| UK | Vodafone | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ? |
A 02 - Top icon shows as 4G, but 4G calling shows as Not registered and Netmon VOLTE shows that VOLTE is not active
|UK| O2 |✓|✓|✓|✓|✓|✓|x|?|
EE - MMS Sent at 2.5G works
EE - MMS Sent to Address Book alias - Unresolvable recipient
EE - MMS Sent to 0-prefixed phone number worked
EE - MMS Sent to +44-prefixed phone number ??
Three - Contract to Three PAYG attempts to use RCS - sent successfully (marked as sent as SMS on IPhone) but takes several minutes to appears on C2
Three - MMS Sent to Address Book alias - Sending … until error (MMS settings IP , no authentication)
Three - MMS Sent to +44-prefixed phone number - Sending … until error
Three - MMS Sent to 0-prefixed phone number - Sending … until error
Three - MMS Received - cycles through Downloading , then Waiting … , then repeat
Vodafone - MMS in - MMS Sent to +44-prefixed phone number - Sent and Received
Vodafone - MMS in - MMS Sent to 0-prefixed phone number - Sent and Received
Vodafone - MMS out - MMS Sent to alias phone number - Error on Send
Vodafone - MMS out - MMS Sent to +44-prefixed phone number - Sent and Received
Vodafone - MMS out - MMS Sent to 0-prefixed phone number - Sent and Received
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