If you don't want to use the Custom-Keys M1 or M2 at the i.safe Mobile IS910.x you have the possibility to delete the presetting of them.
For doing that please follow these steps
- open App List by swiping from the bottom to the top
- start CustomKey1 or CustomKey2
- choose Null for no Application
Uninstall of this app is not possible and a deactivation require an MDM tool.
Want to know more about MDM tools? MDM at Wikipedia