Samsung s21 Ultra sometimes doesn't ring and goes straight to voicemail or can't receive text messages

[XunKasa]

Hi All, 

I have a Samsung s21 ultra and I have had it where it doesn't ring and sends the person who called me straight to voicemail I don't receive any text messages and sometimes when this happens, I can't make any calls. I try to call and it just hangs up. Then when restart my phone all the texts and missed calls come in all at once.  I noticed if the other user has an iPhone it happens more often when they try to call.  I tried resting the network settings, getting a replacement phone, getting a replacement sim card, using a virtual sim card, using wifi calling, and every other troubleshooting steps. 

[vzw_customer_support]

I'm sorry you are running into these issues on multiple devices. Let's troubleshoot this. We will send you a private note.-Joe