I have the same phone as my sister (who's having this problem) and it works fine for me. We've tried removing the battery, turning off and on, and everything in between, but no matter what I change the notification ringtone to, it stays the same. I don't know what the problem is. I've tried customized ones, and default, and neither work. We're using Virgin Mobile if that matters. Her phone seems fine otherwise, don't see what's causing this. Thanks for any help, I appreciate it.