Why can't you play iPhone library through iTunes?

[joejoejoe]

One of the best features of the iPod was that I could take it to my friends computer, plug it in through USB, and play my music.

Why can't the iPhone do this? The library is always in grey font, nothing happens if I click on the songs... so basically I'm somewhere that doesn't have a speakers with an iPod port, or an AUX cable that just so happens to be small enough to fit in the recessed headphone jack, I can't play my music!

Anyone know why?

 

[nlivo]

If you were able to do this with your iPod that means you "manually managed your media" on your iPod. iPhone can only Sync it's content. It cannot manually do anything and you aren't able to play anything off synced iPod's. Hope this helps.