If the "Supplementary services" menu gives you an error message, try these steps: How to turn on or hide your caller ID | Samsung IE
Network-related bugs or outdated firmware can cause supplementary services to fail when trying to communicate with US Cellular towers. How to Fix and Block Caller ID on US Cellular how come us cellular s9 won't block caller id
On the Galaxy S9, the option to hide your number is often deeper than standard call settings: Open the . If the "Supplementary services" menu gives you an
Are you entirely, or is the "Hide number" option just grayed out? How to turn on or hide your caller ID | Samsung IE how come us cellular s9 won't block caller id