Oh my bad. I didn't suspect the issue might be caused for the radio state not being on. I'm okay with calling the `setPreferredNetowrkType()` function once the radio state is on. IMHO this is the right thing to do and keep the `setPreferredNetowrkType()` function returning the error if radio state is off. Moreover IMHO we should do the same for the other settings being set in this file.