How do I do an update my phone is telling me to update I order to use cellular data

haylynn240 Said:

"How do I do an update my phone is telling me to update I order to use cellular data"

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Install a Cellular Update:

It might be prompting you for a cellular update to install. So, go here for that. Update your carrier settings manually on your iPhone or iPad - Apple Support

Call your carrier. They will need to send an update to your phone.