My app is using VoicemailContract functionality that's available in API 14 and higher to insert voicemail messages into the phone's call log. However, some phones seem to have that functionality disabled, even in API versions higher thatn 14. Samsung Galaxy Note 2 is a perfect example of this. So, when the new VM message is inserted into the database, it won't show up in the call log (but this works perfectly on most other phones). So, it seems that Samsung disabled that functionality on that phone somehow, and I'd like to be able to detect that at runtime so that I can hide that option in my app's settings if it isn't available.
Have you tried checking the status?
http://developer.android.com/reference/android/provider/VoicemailContract.Status.html
Vendors can really implement almost anything they want on their phones (which makes android development very annoying) however I think the status should be set to something that is "not okay" on phones that will ignore your api calls.