I am notvery android smart at all....so please be patient with me..... I love my Captivate but miss lots of calls because I do not like the default ringtones so of course I went to the market downloaded songs and make them into ringtones. If I do not turn off my phone often it will go to silent and when I try to play the songs or ringtones it says unable to play..or read format . Has anyone else had this trouble? Any help will be greatly appreciated.............................