For the past week, my mother's phone number is being auto blocked by my phone (Samsung Galaxy S21 Plus). It's a new phone. I have had it for a couple of weeks but this problem has only started happening the past few days. Her number is not in the blocked callers list and I have cleared the cache on both the phone and contacts app and restarted the phone, but she is still being blocked.
On my mother's end, it automatically gets sent to voice mail. On my end, when she does call, my phone doesn't ring but I do get the voice mail notification. In my contacts, under her number, in the history, it says "Blocked call, Declined by phone". I do not get a notification that I missed the call, I only see it when I specifically go into the phone app and the contacts app.
Did a bit more research and discovered my phone has an option called "Call Barring" but when I press on it to view the options, it searches for a bit then gives me the following error: "Failed to read data. Something went wrong. Check your SIM card or network connection, then try again."