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!

No one is going to hack an iphone

It is HIGHLY UNLIKELY that your phone got hacked. Someone must have gotten a hand on your phone, or saw it on Instagram. Apple's security is tight and very protected.

Unless they or you installed an app on it, without you knowing it, it's not going to happen. You likely overshared something on social media and they connected the dots. Your phone is fine. Best luck.

IPhones are hard enough to hack (pretty much impossible). Doesn't matter which country the SIM is from.

It wasn't hacked

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