Sat phones that are installed in the A/c have been integrated with the electrical and electronic systems. They use aerials that are supposed to be used and are a known device.
Having 50/150/+ mobile (cell) phones suddenly try and acquire a signal when a delay is announced - is an unknown quantity of devices that are not integrated into the a/c systems.
derekl I dare say that the phone in question may sometimes belong to flight or cabin crew, but the request is switch off all phones, to minimise risk. In due time, the risk may be better quantified and reduced. I agree that petrol (gas) stations are another example of undue precaution that has more to do with lawyers than reality. Until we know more about these devices on a/c, I am happy to help enforcing the ban.