What is the ruling on placing a supplication (du'a), Qur’an, or anasheed as a mobile phone ringback tone (sada service) such that the caller hears it?

If the alarm sound is a song carrying sublime meanings, wisdom, or supplication, then it is permissible. However, it should not be the voice of a Quran reciter, as this contradicts the veneration and reverence due to the Quran.