Didn’t want to put too many details in the question for privacy sake. Knew a guy with your name in college, was curious if you were the same. Have a great day!

You wouldn’t happen to be Burke from CS, would you?

Likely durability and portability. Think of it as something they use month over month and just mark the day with something like a string band. Bone would be light enough to keep with you, strong enough to not break, and common enough to be available for household use.

There’s an app called tasker that let’s you set up some pretty deep automation on your phone. I’ve used this a set up a grey list on my phone.

If a call comes in from a saved contact, all is normal. If it’s an unsaved number though, it doesn’t ring and goes to voicemail as if I just didn’t answer at all. If, however, they call back within two minutes, it will ring as per normal and I then know it’s, likely, someone who actually needs me.

I set this up because my phone number gets passed around at work quite a bit. If someone really needs me, I always figure they’ll call more than once or text after a missed call.