We understand that you're experiencing issues with calling a number. We'd be happy to assist you with this! For starters, what device are you using? This will allow us to see whether this is a common issue or not.
You can also try basic troubleshooting options using our Troubleshoot & Resolve tool. Select your device to get started. On the next page, select Phone calls beneath Service/network issues. Let us know if this helps!
Collin, AT&T Community Specialist
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*I am an AT&T employee, and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.