Who called from 6503600713

First time this number called my cell. Don't know who it is.

650-360-0713
called me, no one on the other end.  dead line when i try to call back.

I keep getting calls from these number. its getting annoying. they call all day long

Solicitation for $100 Walmart/Target Redemption Card - waste of time

If they are so determined to ring my phone, wht dont they say something when I answer. A gross waste of time and phone co. facalities.