I would have absolutely no problem with a crew member (cabin, flight or ramp) asking - or demanding - that the unit be turned off (whether it's legal or not).
I bought it to make telephone calls with - any other toys are a bonus, but in no way important, and I wouldn't be able to do the 'other things' with my old phone....so nothing lost.
I am, however, particularly interested to note that the only totally positive response to its use in flight is from Arizona.
The instruction manual says it is approved by the FAA - but not necessarily anybody else.
I would also mention that my previous handset did make a tremendous amount of interference with any local electronic equipment in its local area - computers would crackle, monitors would flash.........and it was a total disaster in the television studio that I work in. Certainly my previous phone was a hazard to other electronic equipment.