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When I'm out of range of my iphone so that the watch is connected to cellular, it won't send or receive text messages. I can make phone calls, and I've confirmed that my phone is on. However the messages just time out after a few minutes.
Can’t send text messages on Apple Watch 3... |Official Apple Support Communities
How to use your Apple Watch without your iPhone nearby - Apple Support
To receive SMS, MMS, or push notifications from third-party apps on your Apple Watch Series 3 (GPS + Cellular), your paired iPhone must be powered on and connected to Wi-Fi or cellular, but it doesn't need to be nearby. You also need to be signed in to iMessage on your iPhone.