Gigaset GS180 Manual page 82

Resetting the device to the default settings
You can remove all personal data when you pass on the device to another person.
When resetting the device to the default settings, the internal storage is cleared,
downloaded apps, music, photos, etc. are removed and registration to the Google
account is cancelled.
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Settings
phone
82
System Reset options Erase all data (factory reset) Reset