No, no problem at all.
That's 'cos it's an iPhone, it's made by Apple, it's not Windows, it's not made by Microsoft, so according to the fanbois there's a law of nature that says it can't have viruses.
So ... depends on whether you're an adherent of the anti-Microsoft religion, or whether you believe the science, which says that as it's a computer it can run code, and sooner or later someone will be bothered to write malicious code for it once they've worked out how to turn a profit.