I would like to fly the Standard using a Iphone 5s since its compatible,and the phone I'm using now is not,just to see if I notice any difference. Is it safe if the Iphone doesn't have a sim card in it?
You will have everything but the map unless you download it while you are on wifi. I’ve flown a P4 and a Mavic Pro on a 5S without a problem. The iPad I usually use to fly does not have a SIM card in it. I am usually flying a Mavic Enterprise Dual.