Who called from 3122739245

Agree.  If you have caller ID, and it shows as "Unknown Caller", "Wireless Caller", et al, you are best to let it ring.  After a certain number of calls (four, I believe) over a period of several weeks, they drop your number.

They just called me at work, Pestering me about some survey crap. They have called 4 times within the past hour.

I don't know who called my grandma's cellphone but I want it to stop please.

Don't know who these people are, but apparently they are calling others, too.  Just received a call from them, I did not answer the phone, and they left no message.

Same here!  Two calls in a row, except the 920 call came first.  I didn't pick up either one, and no messages were left.