I recently tweaked a few Samsung call settings to stop telemarketers, and for weeks, it seemed like the problem was solved. Then I realized my phone was quietly blocking real calls too. These built-in filters don't just target robocalls and scam operations. Settings spread across the Phone app and system menus treat every unfamiliar number the same way, and legitimate calls get caught alongside the junk. I tracked down four of them after discovering how many genuine calls my phone had silently rejected.