I get the punting phone bit, but its also dangerous to have one too, nothing is fool proof
Where do you hide it? What if she finds it? What if you forget to switch it off and she heres a text message sound not from yours or hers phone?
Loads of ifs, quite simply they should never ever do it unless you have given them permission, ive 2 phones , im attached i take care but you never ever know!!
Madness that they do this imho, but saying that im booked in and gonna fuck her wooohoo