It is possible for hackers to force some iPhones to connect to rogue wifi access point. If you have one that is affected it is worth following the precautions.
http://arstechnica.com/security/201...ect-to-rogue-wi-fi-networks-researcher-warns/
http://arstechnica.com/security/201...ect-to-rogue-wi-fi-networks-researcher-warns/