My Apple Watch wont connect to wifi
When my iPhone is out of range, updating or turned off, I am unable to connect my Apple Watch S5 (NO LTE) to our home wifi.
Apple Watch
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Perhaps this article will help:
Connect your Apple Watch to Wi-Fi - Apple Support
If you have Apple Watch Series 6, you can connect to 2.4 GHz or 5 GHz Wi-Fi networks. Apple Watch Series 5 and earlier, and Apple Watch SE, can connect only to 2.4 GHz Wi-Fi networks.