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I have an iPhone 6 with iOS 9.2. I've recently frequently found that incoming calls frequently ring briefly and then the ring tone ends and I get an "Call using iphone failed" error on the screen. I do not have this problem with outgoing calls.

I've searched for this error and found a number of threads, but not with any clear suggestions or solutions.

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I noticed that I only had the problem when my iPhone was near my MacBook pro. It turned out that the problem had to do with the Handoff featured introduced in iOS 8 and OS X Yosemite.

When I turned off Handoff and Facetime integration on my iphone, the problem went away. Here are a couple of threads with more details on how to deal with this:

https://discussions.apple.com/thread/6538204?start=0&tstart=0 (final post in thread)

And here's a possible fix that I haven't tried:

http://www.imore.com/continuity-fix

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