Who called from 3212486739

Same as above.

2 calls, no message left.

Calls at least once a day. No message left. Just static.

Called today, no message.  Based on other comments above I suspect it's a robo call just to verify active phone numbers.

Despite being on the DNC list, I get calls from this number. I called it back, and got a recording. In short, it's a robo call trying to sell robo call service.