How to add music to my iphone?

I just got my iphone 4s and a newly version of itunes, when i plug in my iphone itunes asks me if i want to erase all the data in it and sync with this itunes library? I don't want my applications and all to be deleted and i also want to be able to add new music to it! I really need help!

Yeah, connect it to your computer than follow instructions on how to activate the phone, if it doesn't work go your network provider, its a common problem that people have trouble activating their new i phone

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