Add option to require unlock when changing the sound settings, mute all sounds (accessibility) and do not disturb, like in WiFi, Bluetooth and mobile data. The phone could be stolen and they can easily mute sounds or activate DND so you won't hear it even if you call it.
after logged in you can ring your stolen phone although the thief turned on DND or mute your phone, or you can ring your phone by using SmartTag as long as it's within its range
but there's a catch, if the thief manage to cut internet connection then you are done, that's why you must use eSIM in your main phone so it's a bit harder the thief to disconnect your phone from internet
but usually every phone can be forced shutdown, once the thief forced shutdown a stolen phone, then it's gone forever
