You shouldn't use a verse from the Koran as a ringtone—if you answer halfway through the verse that's bad, according to an Islamic group's fatwa. Not to mention the toilet.
The fatwa—which is just a a decree issued by an Islamic scholar—on mobile phone usage issued by a panel of clerics from the Islamic group Jamia Ashraf-ul-Madaris in the Indian city of Kanpur.
Worse still is if you had an aayat as a ringtone and could hear it in the toilet. Senior cleric Ghyasuddin says that, "If the phone rings and an aayat can be heard in the toilet, it is a sin." Also according to the fatwa, you can't even leave the phone on vibrate when you pray, since it's still too distracting.