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Q: Anyone know how to stop my iPhone from hanging up by itself and saying "Call Failed" after being on the phone for 4 hours
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Oct 22, 2016 12:42 PMby irina_w,Hi!
If you are having issues with your calls dropping on your iPhone 6s Plus, try updating your iOS and also checking to see if there are any carrier settings updates as well. Update the iOS software on your iPhone, iPad, or iPod touch
Update your carrier settings on your iPhone or iPad​
After updating your software and the issue persists, try the steps in this link. If you can‘t connect to a cellular network or cellular data
This should have your phone calls staying connected as you expect it to. Thanks for posting in Apple Communities. Have a great day!
