(WCMH) – An apparent outage is affecting some AT&T wireless customers nationwide.

Numerous users on Twitter report being unable to make or receive phone calls. Customers say they are immediately disconnected when trying to make a call.

Outage Report shows thousands of reports of the issue since around 5pm.

AT&T spokesperson Holly Hollingsworth acknowledged the issue, saying, “We are aware of an issue affecting some users’ ability to make certain wireless calls. These users should restart their devices, which should resolve the issue.”https://twitter.com/ATT/status/930966147788361728

Services that use a data connection, such as iMessage and FaceTime appear to be unaffected.