Are you on a limited data plan? Using the phone in roaming? Handing it to your kid? Consider restricting cellular data to prevent making any changes to cellular data settings from the Control Center.
Let's just go ahead and check how to restrict mobile data on your device.
A shortcut: Open Settings app ➜ Tap on Screen Time ➜ Content & Privacy Restrictions ➜ Cellular Data Changes ➜ Enter Screen Time Passcode ➜ select Don't Allow.
See how it works in detail:
Step #1. Open Settings app ➜ Tap on Screen Time.
Step #2. Tap on Content & Privacy Restrictions.
Step #3. Tap on Cellular Data Changes.
Step #4. Enter Screen Time Passcode.
Step #5. Select Don't Allow.
These steps do the job when you give your phone to a kid or someone who is not tech-savvy.
I hope you learned how to use mobile data on your device wisely. Besides completely restricting cellular data, you may choose to enable Low Data Mode. This helps you save cellular and Wi-Fi data if you have a limited plan.