Apple watch sms
Can my apple watch send/receive sms messages to android users without my iPhone being on?
Apple Watch
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No.
https://support.apple.com/en-us/HT205547
Make sure you read the footnotes.
1. To receive SMS, MMS, or push notifications from
third-party apps on your cellular Apple Watch, 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.