You can currently tell if your phone is being monitored, But if you know that your parents watch your every move on the phone, most likely they check on it. Also there are some hackers that good monitor. But the people from the service can't monitor you unless your like a bad person, then like FBI would have the right to see your calls. Hope that helps have a nice day! And good luck with your problem!
The best way is contacting the idf. WWW.IDFTASKFORCE.COM they perform cell phone forensics. It is the only way to find out..