Caller ID displayed "Service Call" - did not answer, no message left.  Will add to blocked numbers.

I have gotten a couple of calls from this number within the last week. Caller ID displays as SVC CALL. No message was left. There's not a lot of info on this number. I assume it's a new scammer/telemarketer. The 414 area code is Milwaukee, Wisconsin. I am in PA.

How do you add all these numbers to block list? Mine only accepts 30

Called but left no message.

Milwaukee, WI called while on the other line. No voice mail left. Rarely answer caller IDs that give location rather than name. Would bet my last dollar this is a telemarketer.