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OK, I ventured a down that rabbit hole somewhat, and it turns out you are, in a sense, both right. In fact, phones had, and still have, a real time clock (RTC) that is able to keep time even with the device powered-off. However, as I learned from here and here, the RTC on Qualcomm devices is read-only. Upon the very first power-on, it initializes itself at 1st January 1970, 00:00:00 UTC ("Unix epoch"), and then just counts from there onwards through the lifetime of the device. Indeed on my (rooted) Pro1, the RTC clock returns rostkatze1:~ # hwclock -r 1973-09-11 08:31:30.407

(lineage-21.0-20240316-nightly-pro1-signed.zip on Feb 5 security patch installed smoothly (*) using adb sideload and MindTheGapps-14.0.0-arm64-20231025_234300) And we still can only select one keyboard layout, so no easy layout switching, for multilingual usage.

One possibility is to find a small bluetooth keyboard that can fit inside normal phone case. Then you could just buy 2pcs of cases and put phone and keyboard to own cases. In the end you could build the sliding mechanism with magnets (see Jolla the other half keyboard) or something else. Here is video and couple pictures if the idea. https://youtu.be/FqYX0ZbC5uA?si=itPnKwmK2GAorypX I think that another Rii keyboard could be usefull (‎4.3 x 2.3 x 0.4 inches so 10,9 x 5,8 x 1,0 cm) https://www.amazon.com/Rii-Bluetooth-Rechargeable-Handhelds-PS3-BLACK/dp/B0B46F8RS6

This is not rom-specific. There are no internal clock in any smart phone I know of, so it needs to fetch the time from some external source. But if it got neither WiFi nor a sim, who could it ask? We had that in some threads here some four or five years back.... It COULD flash the time somewhere in going down so it was not extremely wrong when booting, but would still be wrong, and might be worse if people was unaware that the time slipped backwards each time. So the risk of people thinking the time was right would be higher They could activate GPS and try to get the clock that

Hi Laska, Indeed, what you observe is expected behaviour if "System > Date & time > Automatic date & time" is disabled and/or if automatic syncing of the clock is not possible because of lack of network coverage or because no SIM is inserted in the device. I do not know if this behaviour is specific to my ROMs or if it is a general thing with Android 9/Lineage 16 and the realtime clock. I did not (consciously) change anything in the code with respect to this. A quick internet search suggests it is quite widespread behaviour for Android devices to just assume

The Rii i6 was the best keyboard I could find. I've searched for a long time (it's quite difficult since you mostly get 'mini' keyboards in laptop size) and I think it fits well. Since a Samsung S9 is still wider than the Rii i6, the width doesn't really matter. Size: 15.1 x 5.9 x 1.1 cm - the Pro1 is slightly longer than the keyboard.

Yes, I know but often I don't have data service on this device (I'm, using it without SIM card). But why does it even happening? Of course battery is fully charged. I've never met this kind of issue on a stock rom.