iwatch 3 and iphone se function problems
unable to receive alerts on iphone while wearing watch!
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For alerts, see:
About emergency and government alerts on iPhone and Apple Watch - Apple Support
If you mean notifications, then notifications go to either your Apple Watch or iPhone, but not both. If your iPhone is unlocked, you'll get notifications on your iPhone instead of your Apple Watch. If your iPhone is locked or asleep, you'll get notifications on your Apple Watch, unless your Apple Watch is locked with your passcode. For more info, see:
Notifications on your Apple Watch - Apple Support