The iPhone vulnerable to a certain SMS spoofing attack. Basically, it’s possible for a malicious individual to send a message and specify a reply-to number that is not their own, appearing as if they are someone else, reports “Engadget” (http://macte.ch/mtZjt).
The publication go this response on the matter from Apple: “Apple takes security very seriously. When using iMessage instead of SMS, addresses are verified which protects against these kinds of spoofing attacks. One of the limitations of SMS is that it allows messages to be sent with spoofed addresses to any phone, so we urge customers to be extremely careful if they’re directed to an unknown website or address over SMS.