What does syncing my iPhone mean? - 1
I have a 13 inch Macbook Air and an iPhone 5S with updated software. I want to put a ringtone onto my phone. I already have it set up, but when I want to put it onto my phone, it wants me to "sync" it. It says that it's going to clear the iTunes library on my phone, which has music my Macbook doesn't have. People online say that it's just going to add the songs from my Macbook, and not replace the ones on my phone. Which is right?