I don’t understand… 5.0.0.68 and 5.0.0.70 (the last today) are so différent in time ?
@lamome Are you sure your post is on topic for this thread?
I don’t understand the answer of filip.k. He show a link 17 days ago, and now say that this issue “fixed several releases ago”. For me 17 days is very few. 
I’m saying that your issue might be something else despite similarity.
@robiwankenobi Now that VoLTE support has been released for C2 is the issue fixed for you?
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I have this problem with Xperia 10 plus and have had it since a long time.
Updated to 5.0.0.71 but this did not help.
VoLTE doesn’t seem to be available
VoLTE is very different between devices. So I guess this deserve a separate bug report.
Had the same issue with my C2, reboot did nothing.
Just killed /usr/libexec/mission-control-5, then I could send the SMS.
There was nothing in tx_queue anywhere, ofono was not failing.
I did deactivate Volte just before (il was activated but I don’t know if my provider was supporting it, the white dot was blinking).
I had no issue before updating to latest firmware.
Hey, Good to know I’m not the only one with this issue. I tried killing mission‑control‑5 on my Sailfish OS device and it actually let me send the SMS again.
Might be a kludge but seems to work — perhaps the update left the service in a weird state. Worth a try for anyone stuck with “couldn’t send message.”
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Not sure it’s an issue with service state : each reboot, I must kill the service again to send SMS…