...such as being able to forcibly disembark a passenger immediately upon violating a voice-call prohibition.
Preferably while in mid-air.
But all life is sacred, right ???
Now disembarking their CELL PHONE in mid-air would require a much smaller airlock to prevent the cabin from depressurizing, and would ensure that a first offense (on a particular flight by a particular passenger) likely would be the LAST offense on that flight by that passenger. [If we made it that ALL that passenger's phones were disembarked, it WOULD be the last offense.]
On a more serious note, we don't need this type of law. All we need is for airlines to have a clearly stated policy, something like "You can talk on your phone, but keep it quiet and short. If other passengers complain, you will be asked to lower your voice or end your call. If you refuse, your phone will be confiscated and returned to you at the end of the flight. Passengers who resist the confiscation will be treated using our existing 'unruly passengers' policies, and as such may be banned from the airline or even may be arrested when we land."