One time while I was here while ordering inside, the cashier stopped taking my friends order while he was talking, just to answer her cell phone and spoke for a good 90 seconds.
Even after his jaw dropped, she didn't break character and acted like it wasn't a big deal.
Luckily I don't expect any customer service going here, I just thought that was hysterical when it happened. Overall though, very consistent, I love the food (well, it's a good value), and they are fast.
No real problems here, A-OK in my book. Just make sure none of the workers have to make a call or have a call coming in.