Use cellular data on your iPhone or iPad - Apple Support

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. Turn cellular data on or off To turn cellular data on or off, go to Settings, then tap Cellular or Mobile Data. If you're using an iPad, you might see Settings > Cellular Data. Depending on your carrier and device, you might have additional options listed under Cellular Data Options: Enable LTE, 4G, or 3G: You can select what type of network connection to use for voice and data. Learn more about these options. Learn about data options with 5G on your iPhone or iPad.Turn Voice Roaming on or off: With CDMA networks, you can turn off Voice Roaming to avoid charges from using other carriers' networks.Turn Data Roaming on or off: When you're traveling internationally, you can turn off data roaming to avoid roaming charges. If you have an international data plan, you may need to keep Data Roaming on. Learn more about traveling internationally with your iPhone or iPad....