If you're trying to install or update Instagram and the app is stuck on "Installing," first try turning your device off and back on by following these instructions:

• Hold the button at the top of the phone until the red slider appears
• Slide the red power button off
• Wait about 30 seconds, then hold the top button again to turn your phone back on

After you restart your device, please retry installing the app. Some users have reported that syncing their device with iTunes and reinstalling from iTunes helps with the installation process.

If these troubleshooting steps do not help, please contact Apple support.