Screen Locked With Blue Edges on an Incoming Call (HyperOS): Fixes

When a call arrives and the screen shows a blue border with the interface unresponsive, the phone is not crashing - a layer is drawing over the call screen. That layer is usually a theme or lock screen customisation, a third-party caller-ID or dialer app, or a call service that has stopped responding. Because the symptom looks dramatic, the temptation is to reset the phone. Working through three or four checks first usually resolves it in minutes.

Steps

1. Step 1 Switch back to the default theme

   Custom themes replace system components, including the call and lock screens. Reverting to the default theme is the single most effective test and takes seconds.

2. Step 2 Clear the call service state

   Restart the phone to clear a stuck call service. If the problem returns, clear the cache of the phone and contacts apps rather than their data.

3. Step 3 Check third-party dialer and caller-ID apps

   Apps that draw over the call screen are a frequent cause. Uninstall recently added ones and test an incoming call before reinstalling anything.

4. Step 4 Review permission to draw over other apps

   Apps with permission to display over other apps can leave a frame behind after a call. Review the list and remove the permission from anything that does not need it.

5. Step 5 Update HyperOS and re-test

   A call screen regression in a specific build is fixed by a later update. Install the current build before considering a reset.

Common Issues and Fixes

• Symptom: Blue border appears on every call. Likely reason: A theme is controlling the call screen. What to check: Revert to the default theme and test an incoming call.
• Symptom: The screen is frozen during the call. Likely reason: A third-party dialer or caller-ID app drawing over the interface. What to check: Recently installed apps of that type, removed one at a time.
• Symptom: It happens only on the lock screen. Likely reason: A lock screen theme or widget layer. What to check: Lock screen styling, reset to default.
• Symptom: The problem started after an update. Likely reason: A regression in the current HyperOS build. What to check: The software update screen, then clear the phone app's cache.

Quick Tips

• Revert to the default theme first.
• Restart before clearing any app data.
• Review which apps may draw over other apps.
• Clear caches rather than app data.
• Update before considering a factory reset.

Related Questions

Will resetting fix it?

A reset clears it, but identifying the theme or app responsible takes minutes and saves you the setup time.

Does this affect calls received while unlocked?

Usually the lock screen is where the overlay appears, which is why the effect is most visible on incoming calls.