The same problem did (does) exist with the CRJ family. More than one earlier model was evacuated due to somebody making calls too close to the baggage compartment. The problem has been fixed, but who knows whether a given aircraft will have such a reaction?
In my opinion, people are stupid. People forced into large groups very quickly become lemmings, and will follow the lead of one mindlessly. I think it's just plain safer and easier for all if everybody says "no phones once the doors are closed" for all aircraft and leave it at that. Yes it may not hurt some aircraft on the ground, and the Capt may say "go ahead" during a long gate hold with no danger. The problem is when he has to say "eveybody stop", or when the next Capt determines that an entirely different aircraft shouldn't allow phones even on the ramp. The inevitable response from the pax will be "But last week I was told okay on the ground by Capt'n Bob on Air fifty five and seven eigths, so obviously you're just being an ignorant meanie!" Then the inevitable fight develops and all the other pax say "Yeah, I don't believe the phone can hurt anything because I read
Physics for Dummies while drinking beer last year and I'm an expert".
Can you see where this is going? Let's just leave the phones off and the seatbelts on now shall we?