My Apple Watch won't connect to the AT&T network
Will not connect with art or communication with watch why
[Re-Titled by Moderator]
Apple Watch Series 5
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Did you get a cellular plan for your watch with AT&T?
Apple Watch - Carriers - Apple
The cellular feature of the watch requires a monthly plan (with an additional fee) in addition to your iPhone. Your iPhone and Apple Watch must use the same carrier,* and you must be within your carrier's network when you set up cellular on your watch.