What is the ruling on setting the word "Allah," or the Beautiful Names of Allah, or the name of the Prophet Muhammad (peace be upon him) as a mobile phone screensaver, and what is the ruling on setting the ringtone as the Adhan or a Qur'anic surah?

Firstly, the name of Allah should not be used as a wallpaper for a mobile phone screen, due to the possibility of taking the phone with it into the restroom. The principle is to glorify the rituals of Allah by avoiding taking anything that contains His name into such places. It is preferable to make the screen wallpaper an Islamic symbol like the Kaaba or a beneficial saying.