I'm trying to sync a playlist onto my phone through the computer and it says my device is already synced with another computer with my iTunes account. It only lets me cancel or it gives me the option to erase my contents and sync. Help.

Question

I'm trying to sync a playlist onto my phone through the computer and it says my device is already synced with another computer with my iTunes account. It only lets me cancel or it gives me the option to erase my contents and sync. Wondering how to get my device from the other computer especially since I don't even know what computer it's connected to.

Answer 1

At some stage is is likely to have been connected to another computer's iTunes.  It is now linked to that computer's library and iPhones can only be associated to one library at a time.  Linking to a different one requires wiping the phone.
If you used the phone with another computer you owned you can transfer the iTunes library from that computer to this one and the phone will still be syncing with the same library it was before.
If all there is on the phone are items which can be backed up to iTunes and purchases which can be transferred you could do that, then wipe the phone and sync them back.