available to man won't solve the real problem. eventually he'll be using his own or his friend's cell phones where you cannot monitor. it may be an impossible issue to tackle during his teenage years but you've got to try and fix the problem. doing what you've suggested without addressing it further only means he'll be looking at it with devices and in places he knows you won't be monitoring.
i'm sure you already have thought of this but just food for thought. best of luck. i'm scared to raise 3 teenage boys (ages 5, 3 and 1)