u have to upgrade os4 as new iphone otherwise u cant connect to internet but before u going to do that remember backup your contact list to your pc or mac ok any question feel free to ask me
1st u have to do is . update ur itunes to version 9.2 .
afterthat connect ur iphone to ur pc or laptop .
then go to check update for iphone in itunes . just that easy .
happy enjoy it !