If you are using an iPhone 4s, there are a few things that you can do to keep your device running smoothly. One of the most important things to do is to update your IOS software. This will ensure that your device is up-to-date with the latest security patches and features. To update IOS on your iPhone 4s, follow these steps:

  1. Open the Settings app and select General > Software Update.
  2. Select the Apple iOS Update button and wait for the update to install.
  3. Once the update has installed, open IOS and select Update from the Menu bar at the top of the screen.
  4. Select Install from iTunes if you have not already done so. Once installation has completed, open IOS again and select Update from Menu bar at top of screen again to continue updating your device.