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Are you seeing "User Busy" when trying to call someone? In most cases, this means the other person has another call active. If a recipient sees this when calling you, your phone settings may be preventing them from reaching you. Here's what to do when you see "User Busy" on an iPhone.
Why Do I See "User Busy" on My iPhone?
If you see User Busy when you try to call someone, the recipient may already be on a call and have Call Waiting disabled. It's also possible they have a Focus mode enabled.