This scam originates with seemingly harmless utility apps downloaded from the Google Play Store, such as calendars, alarm clocks, and notepads. When installed, they request overlay permissions, which allow them to appear on top of other apps—and thus display ads over phone calls. These apps can detect when a call ends and will then launch full-screen ads wrapped in a fake call info screen. Since it looks like they are simply part of the call interface, users may be less likely to suspect that they are actually malicious.
How to remove AfterCall ads
Because the ads appear out of context—after a phone call and with content unrelated to the utility app—it's harder for users to figure out what's causing them. The utility apps aren't obviously malicious and don't appear on recent app lists when ads are displayed, so it's not obvious that they are connected to the problem.
Apps > Special app access (this may be hidden behind a three-dot menu) and click on the permission type. Look for apps you don't recognize, or which shouldn't have "display on top" permissions, and uninstall them. You should regularly audit these permissions, and disable any that aren't essential.
On the user side, these apps seem to be mostly an annoyance rather than outright malicious programs that are harvesting your sensitive data, though installing any program that requests unnecessary permissions can introduce significant risk. If nothing else, however, these apps do appear to waste brands' advertising dollars and could damage their reputation with users—but you probably just care about how to stop seeing them after your calls.
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