- Make sure you're running the most recent version of iTunes.
- Plug your old iPhone into your Mac or Windows PC.
- Launch iTunes.
- Click on the iPhone icon in the menu bar when it appears.
- Click on Back Up Now.
- Click on Encrypt Backup and add a password.
- Skip Backup Apps, if asked. (They'll likely re-download anyway.)
- Unplug your old iPhone when done.
- Turn off your old iPhone.
- Take your SIM card out of your old iPhone.
Wait for the backup to complete before proceeding.
- Put your SIM card into your new iPhone.
- Turn on your new iPhone.
- Plug your new iPhone into your Mac or Windows PC.
- Slide to set up on your iPhone.
- Follow the directions to choose your language and set up your Wi-Fi network.
- Select Restore from iTunes backup.
- On iTunes on your Mac or Windows PC, select Restore from this backup.
- Choose your recent backup from the list.
- Enter your password if your backup was encrypted and it asks.
Depending on how much data you have to download, including music and apps, it might take a while for the transfer to complete. Keep your iPhone plugged into iTunes until the transfer is complete.
Your iPhone might feel warm for a while, and you might burn a lot of battery life for the first few hours or even a day due to the radios working and the Spotlight search system indexing. Just let it finish.