I like it a lot that my oneplus 6 can wake up through rtc (real time clock). This means if I set up an alarm for the morning and turn off the phone for the night, my phone automatically turns on and wakes me up at alarm time.
Is this possible for Xperia 10 III too? How to do this?
OnePlus with Sailfish does that!? I always thought it wasn’t possible because of encryption.
One approximate solution is to use Situations from Jolla Store to put your phone in Airplane mode at specified hours.
In Airplane mode you’re not disturbed by calls or messages and it spends less battery.
yes, works and is a nice feature. Thanks Mr. Magister.
Jolla phone does that 
As to answer @Pingutux question, if it doesn’t work ootb, it’s most likely that the phone does not support RTC alarms, my motorola ports, for example, do not.