And what if the aforementioned kid worked for his phone and bought it with his own money, then proceeded to pay for the service through work?
If he has his own line of contract and everything, so be it. Legally speaking, I am sure the parents are in the right to do just about whatever they want in terms of looking through their kids' belongings, including their phones though.
I am guessing most of the folks here complaining about this are not at all in this situation. Most kids want something for nothing. Most kids aren;t going to be super responsible workers paying bills on time and still having their parents being suspcious about what they are doing. I was there what feels like yesterday (scary that it has been well over a decade now... yikes!!!)
Regardless, I mentioned in a post previous how easy it is to just delete secret messages anyway. Kids can get a lot past their parents. And, as a parent, if you think your kid is 100% responsible and completely honest with you you are probably dreaming. If they have a boyfriend/girlfriend, or friends in general, they are probably doing something they aren't telling you that you wouldn't agree with. It's the cost of raising a child these days.
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If I had kids, I'd respect their privacy, and monitor their whereabouts. I want to be one of those cool parents, and not some nosy parent prying into their privacy.
How old are you? Late teens, very early twenties? I ask because I had this same mentality around that time. Unfortunately being the cool parent doesn't keep your kid safe. If you kid doesn't do anything to warrant prying, there likely isn;t a reason to religiously pry into their personal lives. Usually if a parent is asking a lot of questions it is because they are being given a reason to. Of course, there are exceptionsto this, as there are to everything.