(CNN) -- AT&T customers were hit with a massive service outage on Wednesday.
AT&T currently has such speeds in Austin and has committed to offer the service in Dallas.
Thousands of users said they weren't able to make any calls.
The company announced a quick fix on Twitter, telling customers to restart their devices to resume cell service.
They said it could require several tries.
But some customers were responding on Twitter saying it didn't work.
It's not clear what caused the problem.