Write an article based on this "Update Snapchat on an iPhone 5 or newer to get Lenses. Open the App Store to check for Snapchat updates. Tap the "Updates" tab. Find "Snapchat" in the list of "Available Updates." Tap the "Update" button. Start Snapchat. Enable extra features. Access the new Lenses. Troubleshoot upgrade problems."
The new Lenses feature in Snapchat is only available on the iPhone 5 model and newer. If you have an iPhone 4 or 4s, you won't be able to use Lenses, even if Snapchat is up to date.  The Lenses feature will not work on the iPod 5th Generation or older, or the iPad 2 or older. If your older device is jailbroken, you may be able to enable the Lenses feature by installing a small Cydia tweak. Click here for detailed instructions. You can find the button for the App Store on one of your Home screens. This can be found at the bottom of the screen. If Snapchat is not listed here, there is no update available and you are running the most up-to-date version. The Snapchat update will begin downloading immediately. It may take a few minutes to download and install. You can start Snapchat from the App Store page or by tapping the app on your Home screen. When you update Snapchat, the new features may not be enabled by default. You can turn them on in your Snapchat Settings menu.  Tap the Snapchat icon at the top of your Camera screen. This will open your profile. Tap the Gear button in the upper-right corner. Scroll down and tap "Manage". You can find this in the "Additional Services" section. Toggle the sliders for each of the features you want to enable. If you're using a newer iPhone and have updated Snapchat, you can apply special lens effects to your Snaps. Press and hold your face to access the different lens options. Click here for more detailed instructions. Some users have reported problems getting Snapchat to complete the update process. When this occurs, the app disappears from the Home screen and the update stalls.  Open the Settings app for your device. Tap "General" and then "Usage" or "iCloud & Storage Usage." Tap "Manage Storage" in the "Storage" section. Tap Snapchat in the list of apps and then tap "Delete App". Reinstall Snapchat from the App Store.