How to know if someone hacked into my iPhone?

I've heard that it's not so hard to do. I'm sort of worried. Is there any where to find out? Also, I asked one of my suspects online if they did hack my device or not and all they said was that they don't even know how to open their iPad or utilize their Black berry and then I asked if he knows anyone who did hack and he said yes and it was a friend and I asked what was the device and he said Black berry. I'm still worried that someone hacked into my iPhone. I've heard celebrities who tap into their husbands or boyfriendd phones to find out information and they make it sound so easy. I'm worried and I need a helpful answer.

Genius

  • What should I do if someone hacked into my Apple ID? Last night, someone went into my Apple ID. This person sent a plenty of abusive messages to my contacts. I know I didn't do it, because I was just busy watching videos while that person was sending messages. So I have blocked all my contacts to keep low from this person. Well I used to a iPod touch and I lost it last year in my school. After when I lost it, someone must have found it and went inside that account. So is there anyway I can do? I own a iPhone 6S btw
  • How to understand if someone hacked my iphone? I have an iphone 5s, with ios 7.1.1! The SIM cart belongs to our country (iran)! Some one understanded my secret that was in my messages, photos, notes, kik, viber and instagram, all on my phone! I just want to know that is it easy to hack a phone? How can I become sure that they have hacked my phone?! Really thanks!
  • How to know if your iphone is hacked? - 1 I have a friend on Facebook told me don't click his message on Facebook messenger. Before i know that i accidentally click the message on Iphone Facebook Messenger the result it restarted afterwards. I don't know if its hacked or not. i'm using iphone 6S
  • How to know if your iphone has been hacked? I hear all you need is a spy app from Claudia. But can that really get into my iphone? Are there any signs that could tell me I've been hacked?