Help and Support for
Microsoft Lumia 550
Windows Phone 10.0
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I can't make voice calls on my Microsoft Lumia 550 Windows Phone 10.0
Cause 1 of 3: Missed calls are diverted too quickly
Your missed calls are diverted after a specified number of seconds. If your calls are diverted too fast, you need to select a longer period of time.
Solution: Set divert delay.