CallTell speaks the name of who's calling you before your iPhone 3GS or iPhone 4 rings. Find out who's calling you BEFORE looking at your phone! CallTell announces who's calling you before ringing. It also works for text messages! You can even have CallTell read the text message out loud as well. You can enable/disable certain features via the CallTell page, in the Settings app. CallTell uses the volume from the iPod player to determine how loud it speaks. You can configure the app from the Settings Menu.