[Q] Can't change ringtone - S2 hd lte - bell

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http://forum.xda-developers.com – Hi, the problem I've been having is that I cannot change my ringtone at all; I've tried installing mp3 files into the ringtone folder, I've tried using apps to change the ringtone but it's been to no avail; for some strange reason it stays on 'Whistle' no matter how many times I change it... (HowTos)