Could trojan horse infect my iphone?

Could Trojan horse infect my iPhone?
I'm so worried that some Trojan horse virus would infect my iPhone. Please tell me what could make my iPhone infected with Trojan horse?
And I opened some rubbish mail and I'm afraid that my phone could be in danger. I'm afraid that people would get all my personal info in my iphone.

Also, I heard that the phone and computer that infected with Trojan horse would slow down in running, but I don't have that problem. Please tell me if my iPhone would get infected?

Impossible

No, iphones are very secure.

Doubtful. Stop being paranoid.

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