When Odim (Sean Bean) answers his mobile whilst him, Crystal and Rice are at the apartment (about 18 mins into episode), he puts it to his ear and it shows the "slide to" screen on the Apple iPhones. This screen would not appear if he had answered a call on the phone. Sean has obviously been told to turn on the phone when the sound guys play the ringtone so it lights up to give the impression he was taking the call. Unfortunately they forgot to tell the camera team to be careful at what angle they filmed Sean