I don't know about HTC P3300..But I ve imate PDAL Windows 5.0 mobile..For setting mp3 tone I ve to convert it .wav, only then it accepts it as a ring tone..Same may be the case with P3300..
Your phone supprts mp3 ringtones. Move your mp3's to \My Documents\My Ringtones .
Or use your mobile-media-player to set it as ringtone. You may also be able to do it from the menu that comes up; when you keep pressing on the song you wanna use as ringtone.
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