The Apple iPhone supports the following audio formats:
AAC (16 to 320 Kbps)
AIFF
AAC Protected (MP4 from iTunes Store)
MP3 (16 to 320 Kbps)
MP3 VBR
Audible (formats 2-4)
Apple Lossless
WAV
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Some types of mp3 will not play on iphone they will need to be converted
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Not all files of music will work check the bites of music as i have had this happen to me when i download music from limewire or so forth they will not play on iphone very strange problem.
1st To check if its not a problem with phone put a normal music cd in pc and let itunes do it stuff then test it on phone if its there its the mp3 files what are mest up x if there not there your phone is bust

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Also Try finding your mp3 files with ifile maybe there on phone but ipod will not play them x