Safari in Apple iPhone OS 1.0 through 2.1 and iPhone OS for iPod touch 1.1 through 2.1 does not isolate the call-approval dialog from the process of launching new applications, which allows remote attackers to make arbitrary phone calls via a crafted HTML document.
http://www.vupen.com/english/advisories/2008/3232
http://www.securityfocus.com/bid/32394
http://support.apple.com/kb/HT3318
http://securitytracker.com/id?1021264
http://secunia.com/advisories/32756
http://lists.apple.com/archives/security-announce/2008/Nov/msg00002.html