iPhone11 ios 14.8 phone goes directly to voiceMail. do not disturb is OFF

Thanks for posting in the Apple Support Communities SASGeek,

We understand you're looking to help your wife with her iPhone, where incoming calls are going directly to voicemail.

Providing additional information about what's occurring, may increase the chances of getting a helpful response from the community.

Does this occur with all calls, or some? Does it seem to occur with specific contacts, or unknown callers?

Is the behavior occurring in a specific location? Is she able to receive calls in a different location?

Hey many bars of cellular service does the device have? Is Wi-Fi calling enabled?

The more information you can provide, the better community member's understanding of the issue will be, so the most relevant and helpful replies can be offered.

Cheers!