Best way to update iPhone 3G to 4S

hi guys,
got new iphone 4s , i'm wondering what's best way update contacts, media, , game data old 3g new phone.

sync itunes?
shall make backup of data using iphone explorer?

don't have icloud on 3g, , i've been using itunes sync music , apps.

i've never done before suggestions appreciated.

guys!!


sang

 

do backup of 3gs.
when activate 4s on itunes, given option set saved phone backup. choose 3gs backup.

 

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