Apple Watch cellular connectivity issues.
i purchased an Apple Watch 6 and it will not connect to my AT&T cellular plan. How do I resolve this issue?
Apple Watch Series 6, watchOS 7
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If your watch is the cellular version with a red ring on the Digital Crown, check the setup using Set up cellular on Apple Watch - Apple Support as a checklist. If you still can’t get it working contact AT&T to check the provisioning and make sure the watch has been added on your iPhone’s plan.