Last week, excited new Apple Watch owners tried to activate their new cellular wrist devices on networks such as AT&T, T-Mobile, and Verizon. Unfortunately, many were not able to make calls or receive messages. The problems were especially prevalent on AT&T and T-Mobile.
Mac Rumors was the first mainstream site to report on the problems.
"Apple Watch Series 3 models are being delivered across the United States and the rest of the world today, and as customers start attempting to activate their new LTE devices, some of them are running into serious setup issues."
In addition to not being able to send or receive text messages, you also won't be able to get notifications from third-party apps such as Facebook and Twitter. So, according to CNET and others, the best way to make sure your Apple Watch is working flawlessly is to make sure your iPhone is connected somewhere. This confirms the fact that Apple wants you to still use the new Watch as an extension of your iPhone.
Still, there were people all week complaining about their Apple Watch Series 3 devices on Twitter.