iPhone 14 pro won’t show data usage

Hey there and welcome to Apple Support Communities lachlin291,

We can certainly understand your concern and can help provide some insight.

We recommend checking out these steps for more information on how to check your data usage and see if that matches up with your procedure.

" View how much data you're using 

To see how much cellular data you've used, go to Settings > Cellular or Settings > Mobile Data. If you're using an iPad, you might see Settings > Cellular Data instead.

• Scroll down to find which apps are using cellular data. If you don't want an app to use cellular data, you can turn it off for that app. When cellular data is off, apps will use only Wi-Fi for data.
• To see the cellular data usage for individual System Services, go to Settings > Cellular or Settings > Mobile Data. Then tap System Services, in the list under Cellular Data. Cellular data can't be turned on or off for individual System Services.
• You can view the data-usage statistics for an app from a current period, or view app data statistics for apps that use data when you were roaming. To reset these statistics, go to Settings > Cellular or Settings > Mobile Data, and tap Reset Statistics.
• When you’re using an iPhone with Dual SIM, you can see how much cellular data you’ve used with your selected cellular data number.

To get the most accurate cellular data usage from a current period, contact your carrier. "

For additional information, check out this link: Use cellular data on your iPhone or iPad - Apple Support

These steps will help ensure your device is working with ease and can fix common issues like the ones you’re experiencing.

Kindest regards!