Recently I found out that I'm unable to add ringtones those I have converted from .mp3 / .m4a to .m4r. The error message showed that "unable to add the (named files) because iphone unable to read. Before this, it works fine. Anyone facing the same problem? Anyone faced the same problem and managed to find a solution? Mind to share??.... Headache.... headache.....

I will duplicate the mp3 files first then rename the extension file to .m4r. After that either using "Add to library" or just drag the file into itunes. I have tried both methods but to no avail. They just don't show in ringtone category. When I click "Add to library", the itunes just simply don't add the file without prompting any message. When I tried manually add the .m4r file to my iphone in itunes, it just prompt the message the 'can't add the file because iphone can't read it'. Well, my ringtone files all are below 40 seconds and I don't think it should be problem. Itunes and Iphone are up to date. Would appreciate if you could point out what am I missing here. Thank you in advance.

p/s: I did not jailbreak my iphone.

Thank you all the experts who replied. I have tried the method that you all posted. And now it worked fine. I managed to add the ringtones to the phone now. Thank you again.