Upgrading from 3GS to iP4... a few questions

Plug the 3GS into your computer, and in iTunes select it under devices on the left.

To copy all the old apps from the 3GS, click the Apps tab and click "sync apps" then sync down the bottom right.

Also, right click the 3GS under devices on the left and click "Transfer Purchases". This makes sure everything you bought on the 3GS gets transfered to your computer.

Also right click again and select "Backup". This is for the restoration of data to the iP4 later.

Then in the summary tab, click the Restore button and follow the steps. This wipes the phone.

 

Congrats! If I were you...I would do the full software restore [under the settings menu] on 3GS then fill it up with useless stuff [music, podcasts, pics, etc]. All of your apps will restore to the new device when you sync with iTunes.

 

-Settings > General > Reset > Reset All Content and Settings

This should wipe all data completely off your phone.

-When you restore from a backup, that only restores the data of each app, but you still have to sync your apps back on.