What should I do before I give up my iPhone?

You can save all the app data to migrate to another iOS device at a later date by backing the iPhone up to iTunes or setting up a free iCloud account.

This will nicely complement your existing plan in case you forget something until after you turn in the phone. You can restore your backup on to a friend's device long enough to retrieve that additional data and then erase the device. As long as you maintain the iTunes backup on the computer or iCloud access - your backup will be waiting until you get another iOS device to load the backup.

Here are some other apps you may have used occasionally and want to transfer to your Mac:

• voice memos can be imported to iTunes
• call history, SMS messages and voicemail (using an app like PhoneView)

If you have a good backup, you can feel better about having the phone erase all content and settings so you give it back clean and with no personal data just in case your company doesn't do a great job sanitizing the device before re-issuing it to someone else.

Backing it up will save stuff such as app data, including Maps bookmarks but by default, needs to be restored to a replacement iOS device.

iTunes: About iOS backups http://support.apple.com/kb/HT4946