While there is certainly nothing wrong in taking your phone to NASS or CVW, make sure it doesn't become a distraction from why you are there. If you notice many people in public nowadays, they seem to be constantly tapping out texts and/or reading emails, surfing the internet, etc. while ignoring those they are with. Better to put the phone away so you can focus on this once in a lifetime oppportunity at NASS and/or CVW to see if the military might be the path you want your life to take. Spend the majority of your time in the various activities offered and maximize your interaction with your peers and mids who are around.