Who called from 2535617984

Funny... I looked this up and found your post because I am getting the same calls to my house.  The last one was at 12:56AM!!!  The area code is Washington.

Don't know, but they called me at 9:30 am, phone rang once and then clicked off. That's usually a sign of a robot dialer.

I just got the same call. It hung up after one ring. The strange thing about it was the phone # was listed in the normal place on my phone, in the center of the phone display but it was also in the top left corner of the display with the numbers with out the normal spacing ie not in the normal form of ### ### #### but without spacing eg ##########

Same here as to the one-ring-then-hang-up and the strange second number displayed.  Together with this number, my phone also displayed "7015098555," no spaces, no dashes.  

I received a one-ring call last week from 253-561-7933 - same area code, same exchange, similar last four numbers.  Same caller, lots of lines, I'm thinking . . . .