Who called from 7754326376

Caller ID = Out of Area.  Two calls in last 1.5 hrs... no message left.  Now blocked.

Just a head up got two calls from them already today.  Says it's a research group.  I hung up on them.

3 calls yesterday they no one there

Twice today, didn't pick up either time, "caller unknown" on ID display.  775 is northern Nv.

We've received four calls from this number in the past two days. Caller ID says Reno, NV. I didn't answer the first three times and they didn't leave a message. I picked up the phone the fourth time, but they hung up after a couple of seconds.