Mail in Apple iPhone 1.1.1 allows remote user-assisted attackers to force the iPhone user to make calls to arbitrary telephone numbers via a "tel:" link, which does not prompt the user before dialing the number.
https://exchange.xforce.ibmcloud.com/vulnerabilities/36853
http://www.vupen.com/english/advisories/2007/3287
http://www.securityfocus.com/bid/25862
http://securitytracker.com/id?1018752
http://secunia.com/advisories/26983
http://lists.apple.com/archives/security-announce/2007/Sep/msg00001.html