This is mundane but I think about it every time I shut down my droid phone.
It vibrates and makes this baa wahh! Sound.
Almost exactly the sound a calf makes. I grew up helping my uncle raise calves and feeding them on bottles. Wonderful memories and I love that sound they make.
If you never heard a crying calf. Skip to the 9 second mark of this video.
Now you too can smile every time you shut down your phone. 
No, I’ve never noticed such a thing, likely because I keep my phone’s sound off. 
That’s because all of this “microchips” stuff is just mumbo-jumbo. A smart phone is actually operated by the imprisoned soul of a young calf. It is in constant, endless terror.
And pain. Don’t forget about the pain. Calf soul terror and pain is what summons Uber.
I’m going to stake out the controversial opinion that smartphones don’t sound like cows, unless you put a bleating cow ringtone on one.
Flame away.
I only hear it when the phone shuts down. I think the mechanical motor that makes it vibrate is creating that sound.
Mmmmmmmm, I do love me some veal.