You may have performance issues if your Apple iPhone 4s:

• Performs slowly
• Freezes
• Turns off or unexpectedly restarts
• Displays error messages
• Is unable to install or update applications

Try each of these steps to see if it helps improve your phone's performance.

1. Perform a soft reset.

   A soft reset restarts your phone and does not erase any of your content or data.

   1. From the home screen, press and hold the Power key and the Home key.
   2. Release the Power key and the Home key when the Apple logo appears.
   3. Your Apple iPhone restarts.

2. Charge your Apple iPhone 4s.

   If your Apple iPhone 4s is low on battery, it will attempt to extend the battery life by slowing performance down. If an application or background process requires higher performance, it may make the phone appear freeze or slowdown. Charging your device will provide enough power for the phone to function normally.

   Charge your device.

3. Determine if your phone has low memory.

   1. From the home screen, tap Settings.
   2. Tap General.
   3. Tap Storage & iCloud Usage.
   4. If your phone has low memory, troubleshoot low memory issues.

4. Close background applications.

   Some apps continue to run in the background after you exit them. Sprint recommends that you close background applications when you're not using them.

5. Perform a DFU mode update.

   A DFU mode update uses a special phone state that allows your Apple iPhone 4s. to communicate with iTunes without your iPhone fully turning on. DFU mode is used to update or restore iOS

   Note: While performing an update or reinstalling using DFU mode, iTunes will try to preserve your settings and content. If Restore is selected, all settings and content will be erased.

   1. Connect your iPhone to a computer with iTunes installed.
   2. While your iPhone is connected, press and hold both the Power and Home buttons.
   3. When and iTunes logo, arrow, and lightning cable appear on the screen, release both keys.
   4. An iTunes prompt will appear to either Restore or Update. Choose Update.

      Note: Restore should be used as a last resort. Choosing Restore will erase all content and settings.

   If updating takes longer that 15 minutes, your iPhone will leave recovery mode. If your iPhone leaves recovery mode, repeat steps 2 thru 4.

6. Verify that your Apple iPhone 4s is running the most recent software.

   There may be a software update that resolves the issue on your phone.

   • Check for software updates from your iPhone.
   • Update software using iTunes.

If you're still having issues, try the Sprint Community pages or make an appointment at a convenient Sprint Repair center.