Some Android users have been encountering full-screen ads right after phone calls, but this is not a built-in feature. Security researchers have linked the behavior to an ad fraud tactic known as AfterCall, involving apps that use overlay permissions to place ads above the phone interface.
How the tactic works
The apps behind this pattern often look harmless at first glance, including tools such as calendars, alarms, and note apps. Once installed, they request special permission to display content over other apps. That access lets them trigger ads after a call ends, often inside a fake call-style screen that makes the promotion feel like part of the system.
Unlike standard permissions, overlay access must be enabled in system settings. Android is designed to ask for a clear reason when an app needs it, but some of these apps use vague explanations or may stop working if permission is denied. That makes it easier for users to approve access without realizing how it will be used.
How to check your device
If this happens on your phone, review which apps can appear on top of other apps. Open Settings, then go to Apps and Special app access. From there, look for the permission related to display-over-other-apps and remove access from apps you do not trust or do not need.
Regular permission audits can help keep Android devices cleaner, more transparent, and easier to manage. As mobile platforms continue refining permission controls, users may gain stronger protection against deceptive ad tactics in the future.
