Activate cellular data
How do I activate my cellular data for my Apple iPads
iPad, iPadOS 15
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Assuming that you have a WiFi+Cellular model of iPad, see:
Set up cellular data service on your Wi-Fi + Cellular model iPad - Apple Support
The iPad User Guide is a rich source of frequently overlooked information about your iPad and iPadOS. The Guide is available both online using a web browser (such as Safari), or as an Apple Books download:
iPad User Guide - Apple Support
https://books.apple.com/book/id1567104892