Siri, IOS Intelligent Personal Assistant Answers, IPhone 4S

Siri was launched as an integrated feature, although as a beta version, of the Apple iPhone 4S, launched in October 2011 & currently remains an iPhone 4S exclusive . But some hackers have ported Siri onto the iPhone 4 as well , & they claim that Siri would eventually be available for jailbroken iPhone 4 in near future .
Funding
Siri was founded in December 2007 by Dag Kittlaus (CEO), Adam Cheyer (VP Engineering), and Tom Gruber (CTO/VP Design), together with Norman Winarsky from SRI International's venture group. On October 13, 2008, Siri announced it had raised an $8.5 million Series A financing round, led by Menlo Ventures and Morgenthaler Ventures. In November 2009, Siri raised a $15.5 million Series B financing round from the same investors as in their previous round, but led by Hong-Kong billionaire Li Ka-shing.