and replace it?what? Does this mean all my itunes on my ipod part of the phone will be erased? "an iphone can be synced with one one itumes library at a time. Erasing and syncing replaces the contents of this iphone with the contents of this itunes library." Do I want to erase this iPhone (my phone) and sync with this iTunes library (ringtones)? is what it is saying to me. HELP!