How do i know or detect whether my iphone4 has a spyware?I'm currently using OS7.0.3.

I suspect my iphone has been spied.But i heard from others if an iphone has been spied,it will have a cydia app or when you update your OS all contacts will be gone. Fortunately,i don't see a cydia app nor when i update my OS my contacts are gone,my contacts are still intact.But somehow i still feel it has been spied.How do i precisely detect whether my iphone has a spyware or not?Pls help!Thanks!

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