I use Calls Blacklist [1] to block calls from unrecognized numbers -- just checked, it supports blocking numbers based on "Starts with" so that would probably w

I use Calls Blacklist [1] to block calls from unrecognized numbers -- just checked, it supports blocking numbers based on "Starts with" so that would probably work, if you're on Android. [1] https://play.google.com/store/apps/details?id=com.vladlee.easyblacklist&hl=en&gl=US https://play.google.com/store/apps/details?id=com.vladlee.ea...