The options
Prefer Cellular Data and
Cellular only can be only used once you have enabled on your Android device. Otherwise, those two options will be
grayed out and disabled and the message
Enable "Developer Options"
> Mobile data always on" will be displayed above them.
If
you have enabled Developer options on your Android
device but the Mobile data always active option is
not yet enabled, then by tapping on the aforementioned message, you will be
redirected to the Developer options screen on your
device. From there, you can enable the Mobile data always
active.
After enabling on your Android device, you need to sign out and sign in
again into OpenScape Mobile Pro before being able to use the advanced
network settings Prefer Cellular Data and
Cellular only.