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[Justman]

My device go blank whenever I receive or dial number.

[xavinux]

Hi @Justman

Please, boot your device into safe mode as explained here. If this issue is not present in this mode, that indicates a third party app is causing the problem. In this case exit Safe Mode and then un-install any third party apps you don't need and clear the cache/data for the apps you want to keep. I'm at disposal for any question.

[_alexdon_]

@Justman You can also remove the SIM and check to see if the same problem occurs with another.