How would one sabotage a cell phone for safety reasons?

My teenage daughter will be getting her driving license this week. Despite numerous warnings by her mother and I, unless her phone is turned off when a text message alert comes in she is distracted for a second and wants to see who the text was from.

While teaching her we have turned it off. But I know teens and know that when she is on her own she most likely will not have the discipline to do this and I want to find a way to just stop incoming texts completely during the time I know she will be behind the wheel. Once she drives we will not always be there to enforce her self-discipline.

I am now having nightmares about this. She is a good kid in every other way and I am not seeking to punish her. However I am considering even sabotaging the phone so she is forced to go back to the old type that is less distracting.

How would a person sabotage an iPhone without leaving evidence?

(Oh and yes- we have talked to her about this but texting appears to be an addiction with her generation.)

Thanks for any input- signed a Sleep-Deprived Parent