This is interesting, because over the holidays, I was on an EZ flight from LHR to PFO. As we began our landing approach (read 3-5 minutes before touching down), the flight attendant made an announcement that we needed to make sure that all mobile phones and electronics needed to be off, because they could interfere with our ability to land safely.

Now, I don't know much about any of it and whether or not it will interfere, but nothing burns me up more than watching someone actively ignore this request. I was sitting next to a jerk in first on an AA flight last year who was ON THE PHONE as we were on approach, and the flight attendant just sat there and watch them. I was on a WN flight last month where two girls turned on their iphones and called as we were beginning to accelerate and take off.

The bottom line? There's a reason for these rules, whether I understand it and agree with it or not... and I don't want to be the one to find out whether or not they interfere with take off and landing. Your phone call is not that important.