Incoming Calls
My iphone isn’t showing me incoming calls if I’m already on a call. What can I do to solve this?
iPhone XS Max, iOS 14
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See the information about Call Waiting in Set up call forwarding and call waiting on iPhone - Apple Support
and be sure to note the following from that link:
If you have cellular service through a CDMA network, contact your carrier for information about enabling and using these features.