Who called from 5510267501

Received a call to my business, this person did not give me their name, or reason for call, then hung up.

i get one of these calls every other week, i dont answer it but its strange it comes over as +551026750131    i have no clue

can anyone help

Same thing here the number appears as 551026750131, just a bunch of background noise and nothing else.

I receive a call from 551026750131 about every week or so on my business cell phone, I never answer, but it is still annoying.  It appears that now they have added additional digits to the end of the previously reported number.