The reason I ask is because, somehow my Father installed spyware on my iphone 6 that allowed my Parents to see my text messages. I don't know how He did this since I keep good track of where my phone is, and it never went missing. Also, how would He bypass the passcode lock to do it? I have since updated IOS disabling it hopefully!
Read more: https://iphoneus.org/faq/can-you-put-spyware-on-an-iphone-remotely.html