Best report
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May 30, 2016
Here's some answers on this. The call blockers & phones now have area code blocking which is good since as you mentioned, they only change by a digit or two. This I have found works the best. And they will change area codes but not so very quickly as they do the number they are spoofing.
http://800notes.com/forum/ta-e433d104c45c9b7/ ... oofed-caller-id
http://800notes.com/forum/ta-c3355f57425c0d5/ ... alls-to-the-fcc
http://consumerist.com/2015/07/22/45-attorney ... lock-robocalls/
http://800notes.com/forum/ta-c5c7e69f0670886/ ... -spoofing-calls
http://800notes.com/forum/ta-c46b87360deec56/ ... -unwanted-calls
https://www.ftc.gov/news-events/press-release ... ainst-political
http://800notes.com/forum/ta-e433d104c45c9b7/ ... oofed-caller-id
http://800notes.com/forum/ta-c3355f57425c0d5/ ... alls-to-the-fcc
http://consumerist.com/2015/07/22/45-attorney ... lock-robocalls/
http://800notes.com/forum/ta-c5c7e69f0670886/ ... -spoofing-calls
http://800notes.com/forum/ta-c46b87360deec56/ ... -unwanted-calls
https://www.ftc.gov/news-events/press-release ... ainst-political