5 Monitor Your Device’s Storage
If you have many apps, photos, videos, and text messages saved on your phone, then there’s a chance that you could max out your device’s storage, especially if you have a 16GB iPhone. And while it can be tempting to live on the edge and only clean up your storage when notified, this can actually slow down your phone.
Utilize the suggested storage cleanup options available in Settings > General > iPhone Storage. These suggestions include deleting old text messages, offloading unused applications, and other tips for increasing storage.