Are you asking about the moral side of the question or about the technical one? Speaking about technical one - there're a lot of spy apps for you to use. Morally... well, I think that it's OK, because you have the right to know and you need to influence your child from time to time.
I recently purchased iphone 4s for my son and for me.. I am planning to install an spy software which i can monitor or track the web history and the location. Am trying to prevent pornography from getting to my childs phoneMy friend suggest me to use COPY10 which i love the features of it. is it good for us to instally spy software on the phone?