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?

It's not really that simple, many more factors need to be taken into account, access through Wifi? Through 3g? Through bluetooth.

Bluetooth being the most unsecured, but its still plenty more difficult then that.

Easiest way to check, are files missing, do basic features of the phone still work? Do you still have security on you're phone I. E. Does it have a number lock or swiping feature?