There are a few circumstances in which you'll want to delete your iPhone4s data and settings, restoring the phone to its factory-new condition. These circumstances include when:
1. The phone is being sent for repairs and you don't want your personal data available to prying eyes
2. Your You're selling or giving the iPhone4s away( such a kind act lol)
3. phone is so messed up that it needs to be erased and set up again from scratch.
It's a drastic step, of course, because deleting all the music, apps, email, and settings from your phone--unless you backed it up, that is-–you won't get it back. Still, in situations like those described above, it can be necessary.
You can delete your iPhone4s either when your phone is synced or through onscreen commands. Whichever process you choose, always start by syncing your iphone4s to your computer, since this creates a backup of your data. With that, you'll be able to easily restore your data and settings to a new 4s. To delete your iPhone4s when it's synced, click the "Restore" button in the Version section of the iPhone4s management screen and follow the onscreen instructions.
This image shows what the menus should look like.
Once the sync is complete and your phone is backed up, you can disconnect it from your computer. When this is done, go to your phone's home screen and tap the Settings app (if you've arranged your apps or put them in folders, the Settings app may not be on your home screen. If not, locate it wherever you put it).
In the Settings app, tap General.
In General, scroll down to the bottom of the page and tap Reset.
On the Reset screen, you'll have a number of options for deleting iPhone4s data and settings.
Reset All Settings - This deletes all of your preference settings, returning them to the defaults. It will not erase any of your data or apps.
Erase All Content and Settings - If you want to fully delete your iPhone4s, this is the option to choose. When you tap this, you'll not only erase all of your preferences, you'll also delete all music, movies, apps, and other data from your phone.
Reset Network Settings - To return your wireless network settings to their factory default states, tap this.
Reset Keyboard Dictionary - Want to remove all the custom words and spellings you've added to your phone's dictionary/spellchecker? Tap this option.
Reset Home Screen Layout - To undo all of the folders and app arrangements you may have created and return your iPhone's layout to its default state, tap this.
Reset Location Warnings - Each app that uses the Iphone’s gps to be location aware asks your permission to use your location. To reset all of those warnings to their default off state, select this.
Your iPhone4s will give you warning asking if you really want to delete your iPhone4s and giving you an estimate for how long the process will take. If you have changed your mind or accidentally gotten here, tap the "Cancel" button. If you're sure you want to go ahead, tap "Erase iPhone4s."
How long the deleting process takes will depend on what you chose in step 3. And even though the iPhone4s gives you an estimate for how long it will take in step 4, the deletion often goes faster.
Once you've deleted your iPhone4s, it will restart and you'll have an iPhone4s with either all new settings or a completely empty memory.
From here, you can do what you like with the iPhone4s:
Send the phone into apple for repairs. Take the phone in for repairs. Sell the phone for a happy buyer. If you must you can give it away . Your done enjoy your cleaned Iphone 4s.