How do I resolve "Call Failed" when I try to answer a call on my Apple Watch?
How do I resolve"Call Failed" when I try to answer a call on my Apple Watch???
[Re-Titled by Moderator]
Apple Watch Series 4, watchOS 5
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Make sure that your Apple Watch is close enough to your iPhone to make a good relay connection. The two devices may be just far enough apart to allow for good data coordination (small bursts of simple data) but not enough to set up the voice connection. Good luck.