Customers affected by the problem who attempt to make a phone call are seeing the calls they place immediately disconnected. Incoming phone calls go directly to voicemail, and customers are not able to answer them.
Many users have been able to fix the phone call problem by restarting their iPhones, so affected customers should try that right away to attempt to resolve it.
If a restart doesn't work, customers who need to place calls to friends and family members can still use FaceTime or FaceTime Audio. iMessages and text messages are also working at the current time.
Update: AT&T has confirmed that a restart fixes the issue, and is asking customers who are experiencing call problems to restart their iPhones. The company says multiple restarts may be required.
