When Capt. Strand grabs his phone to call Capt. Vega to find out what happened, his phone is upside-down when he's holding it. You can see the speakers and charger port at the top of the phone.
When Capt. Strand calls the station to find out what happened since Capt. Vega wasn't answering, his phone is clearly shut off since it isn't lit when he brings it to his face during the call.