We've become so dependent on our cellphones that misplacing them can be the source of great distress. A gym friend said he found himself using the flashlight function on his phone to search under furniture for ... his supposedly missing phone.
That's totally something I would do. My first thought is, oh, let me try calling my phone so I can hear it ringing.
The more experienced Dearest Partner says he looks for his phone using the Bluetooth function in his work truck: if it connects, as he says, "I know it's in there somewhere." (Last time, he found it upside-down in the well next to the accelerator pedal.)