I lost my iPhone 5. If I sync, will it load my old data from the last time I synced?

I recently lost my iPhone 5 and am using my iPhone 3 until the replacement arrives. I would like to get the new contacts and songs that I had on my iPhone 5 (I synced about a week before I lost my 5). If I sync, will it add all the new contacts, songs, texts, etc to my 3? I'm just worried about losing data.

Yes it will sync back mine did I had sync then lost the phone when I plugged my new phone it asked if I wanted to backup I click yes

Yeah you can also sync with icloud, then when you sign on with the new phone it will reload also that way.

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