I am so excited about this I just have to post it. I just upgraded to the latest version of iOS and found there is a button in Settings-Phone that allows you to silence calls from non contacts and send them to Voicemail. And it actually seems to work. My phone was ringing like 3-5 times a day with these bs calls and now all I get is a notification of a missed call when I look at my phone.

Maybe this is old news to more tech savvy people here but I am very happy about this.
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And still trying to figure it all out.................. buffalo