How Can I Infiltrate an iPhone 6s?

Sorry for the vague request, but I'd like ideas on how to get back at some guy who harassed my daughter online. Ok, so I have his handphone number, his address, and a working laptop to install whatever I need. I have an E-mail spoofer, and I am also proficient in HTML and CSS (won't help much in this case) and I'm currently learning JavaScript. I figured I'd turn to the community for ideas and angle of attacks. I have no physical access not am I within close proximity of the target. Help please?