[muyoso]

No offense, but unless your daughter rides the short bus she will figure out within a day how to circumvent any program you choose. Much better idea to just tell her that she has to maintain a certain GPA to have the benefit of a cell phone, and the instant she doesn't meet it take it away. I mean, your daughter will HAVE to figure out that by simply changing the time on her cell phone that it will never lock, unless of course she is very very very very very very slow, which I doubt she is.