Another workaround maybe Flight mode on before and Flight mode off after crossing the border.
Changing sim card slots was enough for me to get this warning, but after first restart I started ignoring it, worked fine, but no guarantees that some provider with some specific settings won’t suddenly fail, so ymmv
EDIT: to clarify, I don’t think this is a bug, just a warning from jolla they detected a situation that in some cases could result in unexpected behaviour, if you want to ignore it just tap outside and do that, just be aware that they suggest a restart so if you’re waitng for an important sms/call probably best to do that
A phone software should be able to handle all situations like switching from SIM 1 to 2 and back, crossing borders (=switching home/roaming) flawless without warning or suggestions what the user should do now, but only information/status report. So this IS a bug respectively the warning points at a bug. This should not happen!
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In ideal world yes, but:
If google does it it’s currently de facto standard as poor experience as it is (I mean imagine jolla getting operators to send a sms with such message)
Edit: which sadly confirms we’re already in a dystopia where a huge corp with thousands of engineers can’t fix a problem, so turn it off and on again is acceptable solution, and people thought IE tweaks were the problem, now you can’t use your email provider because browser isn’t chromium of recent enough version
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OK, so it seems that the handover from home net to roaming doesn’t work for network + firmware reasons and this is out of Jolla / SFOS’s range. Good to read that same things also happen on A*.
edit: with an experimental system one has always the feeling to be the only one with bugs, but this is not true. On A* phones there are also a lot of things not working as they should.
You can probably do the hard delete of ofono settings and it might work (it was point 3. of some support article of troubleshooting network connectivity issues), but it’s safer and more non-cli user friendly to do what android users do and not try to fix what googol with its thousands of engineers couldn’t fix
Unfortunately, I have encountered this message or something similar (SIM card inserted or SIM card removed) a few times.
No, the workaround does not work.
I had the same problem two weeks ago. Boarding a plane in Germany and landing in Spain. As soon as the phone left the “Flight Mode”, I got the “restart” message.
In fact this issue has been present for a loooooooooong time -at least three years-. I had this issue in my XA2 and now my 10III when crossing every border (by car) in the route D-A-CH-FR-ES (and the other way around).
It is not the end of the world, but it is pretty annoying having to restart the phone so often.
I remember having these issues with my old Xperia X. Then everything was fine with the XA2.
Now with my 10 III roaming did not work out in Austria but worked in Switzerland and Poland. I didn’t do much traveling the last year.
But the reboot issue seems to be very similar to the problems of summer 2019.
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I also had this issue on XA2 travelling between A and H in summer 2019, but it disappeared with the next SFOS update. I don’t remember the version exactly, maybe it was 3.4 to 4.0?
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I am sorry, I do not remember the OS-Version but I had to reboot in Denmark, Norway, Sweden, Poland, Austria and Germany.
I can’t find the source, but disabling the SIM PIN may help with mysterious cellular issues. (I guess it works by changing the timing/ordering of things in the cellular modem? No actual clue though…)
I didn’t have mobile data when I was in Sweden, the next time I’ll try that (it’s the only thing I didn’t try yet).
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oFono Log when I cross the border into Bosnia and Hercegovina:
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And the freqent reboot is here again with my 10 III, 4.5.0.21 at the danish, swedish and finish border.
Also there are some reboots necessary when switching from WiFi to mobile networks in the very, very rural area in Finland where I stay at the moment.
Thanks for the report, internal bug report created.
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no, it’s not, please don’t use Google as an excuse. The fact that Google is doing something in specific way doesn’t mean we should all follow it. If you’re ok with that, please use Android.
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I got this error several times these last time and found out that the Internet connection still works. Unfortunately, there is no possibility to enable data from Top Menu as it check if there is a SIM.
As a workaround, I disable this check and can now enable data from Top Menu even the phone think there is no SIM card.
The file to modify is /usr/share/jolla-settings/pages/mobile/EnableSwitch.qml
Replace:
available: simToggleAvailable
&& AccessPolicy.mobileNetworkSettingsEnabled
&& !mobileData.offlineMode
With:
available: AccessPolicy.mobileNetworkSettingsEnabled
&& !mobileData.offlineMode
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I realize it’s unfortunately not enough and I still need to restart my phone once the notification appears 
I catched some logs if needed.
I had that with the X years ago, it disappeared somewhere round the XA2 and came back with the 10 III. Tested all around Europe.
I also had this but it’s long ago. It was in 2019 on XA2, and it came after update either from 3.3 to 3.4 or from 3.4 to 4.0. Unfortunately i don’t remember exactly.