Who called from 6184414753

I just received around ten calles my phone auto blocke in 2 minutes from this number

I just received 5 calls in 1 minute.

Just got a call from this that we didn't answer.  It left a message...30 seconds of almost modem-like clicking (not exactly like an old modem, but sort of along those lines).

3 calls right in a row. No message. Just want to knw who it is

Got ANOTHER call, this time no model-like message.  Would like to know what it is too...