Ish. Always gotta be sublties, right? 
Prepaids are generally assign a block of numbers that they can get. Technically they wouldn’t have to be contiguous, but in practice they are.
So you get a few prepaid burners, note their numbers, and +/-1000 you know the incoming call is from a prepaid.
There are also burner apps, but those numbers are even easier to trace. You’d need to spoof calls from some real hardware–which isn’t all that hard, but harder than walking into a walgreens–to evade trivial detection.
