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Zoiper disappearing from background on Huawei devices

With Huawei devices, to allow Zoiper to work on background you need to do the following:

  • Install ZoiPer and start it.
  • Select "No" when prompted to "ignore battery optimizations" 

  • Open Android Settings - Apps - Advanced

  • Select "Ignore Battery optimizations"

  • Select filter "All apps".

  • Find Zoiper and set it to "Allowed"

 

And to allow Zoiper to work while your screen is locked you need to also do the following:

  • Open Android Settings
  • Search for "Applications"
  • Find "Zoiper" and tap on it
  • Select "Battery"
  • Enable "Allow Execution when screen is off"