Use cellular data on your iPhone or iPad Find out how much cellular data you're using, and learn how to turn cellular data on or off for all apps or individual apps.
To access the internet on your iPhone or iPad when no Wi-Fi is available, you'll need to turn on mobile (or cellular) data. This easy guide will teach you how to enable mobile data on any iPhone or iPad. If mobile data isn't working, we'll also help you troubleshoot and fix the issue.