How can I restore my iPod playlist on my iPhone?

Have you been managing your iPod from your computer, using iTunes? If so, the Playlist should be in iTunes.

If you have been managing the phone from the same iTunes Library, simply add the Playlist to the phone.

On recent Macs, rather than use iTunes, one uses Music (I think) and Finder.

If the Playlist is not in your iTunes Library, your only hope is to remember what was in the Playlist and recreate it on your phone. If the songs are not already on your phone, where did you get them from for the iPod (was it from the itunes store, CD, or another online store. Or is it a mixture?)