My phone is telling me i cant use data unless i do system update
I cant do a system update and it wants me to do an update to connect to cellular data
iPhone 7, iOS 15
Question marked as
Your post doesn't give much detail, but I suspect the update required is a network/carrier configuration rather than the iOS software version. See if this document helps any
Manually update your carrier settings on your iPhone or iPad - Apple Support
If that doesn't help try a call to your cellular provider for their support.