iPhone 4S and Siri — The First iPhone with a Voice Assistant

Apple announced the iPhone 4S on Tuesday 4 October 2011, opened pre-orders on 7 October and put it on sale on Friday 14 October. The first wave was seven countries — the US, Australia, Canada, France, Germany, Japan and the UK — so Japan launched on day one. Apple said at announcement that 22 more countries and regions would follow by 28 October.

From the outside it was nearly an iPhone 4: the same glass-and-steel slab. What changed was inside, and what happened when you held down the home button.

Ten days in October

The product story and the company story overlap here, so it helps to lay them out in order.

Jobs was not on stage. The 4S was the first iPhone Cook introduced as chief executive, and Jobs died the following day. The phone is sometimes called "Jobs' last product"; Apple never framed it that way, so this page records only the sequence.

Japan gets a second carrier

For Japan, the significance lay with the carriers.

Since the iPhone 3G in 2008, SoftBank Mobile had been the only Japanese carrier selling the iPhone. With the 4S, KDDI joined; its release was headlined, simply, "au's first iPhone". Both carriers opened reservations at 4 p.m. on 7 October and went on sale on the 14th.

The au version shipped with a gap. FaceTime and iMessage did not work on it at launch, and that was fixed only by iOS 5.1 in March 2012 — ITmedia's report on that update lists FaceTime and iMessage on the au iPhone 4S alongside Japanese Siri.

Where Siri came from

Apple did not build Siri from scratch.

It began as CALO — the Cognitive Assistant that Learns and Organizes — a research effort led by SRI International inside DARPA's Personalized Assistant that Learns (PAL) programme. SRI spun out Siri, Inc. in 2007, and Apple acquired the company in April 2010. The iPhone 4S, eighteen months later, was the first product to ship Siri as part of the operating system.

Apple's own launch description was cautious. The press release said Siri would be available "in beta" on the iPhone 4S, in "English (localized for US, UK and Australia), French and German", and listed the jobs it could help with: calls, texts and email, meetings and reminders, notes, web searches, finding local businesses and directions. It ran only on the 4S. An iPhone 4 updated to iOS 5 got everything else in the release, but not Siri.

That exclusivity did the selling. For a phone that could not be told apart from last year's model by looking at it, Siri was the one-word answer to "why buy the new one?"

Japanese Siri, five months later

Buyers in Japan could not talk to Siri in Japanese on launch day. Set to English, French or German it worked; Japanese it did not understand.

Japanese came with iOS 5.1, which Apple announced at its new-iPad event on 7 March 2012 (US time) and which reached Japanese users on 8 March. Japan was a first-wave country for the hardware and a second-wave country for the headline feature, about five months behind.

What changed inside the case

Siri overshadowed a substantial hardware update. From Apple's launch material:

The multipliers are Apple's figures. Apple also called the 4S "the first phone to intelligently switch between two antennas to send and receive" — a claim made a year after the iPhone 4's grip-and-antenna controversy, which is covered on the iPhone 4 page. Supporting both GSM and CDMA meant one model could run on CDMA networks such as Sprint, which joined as a US carrier with this phone, and on the GSM/W-CDMA networks of Japan and Europe.

Launched alongside iCloud

The 4 October release was not only about a phone. The same document announced iOS 5 and iCloud: iOS 5 went out free to existing iPhones on 12 October, and iCloud bundled sync services such as iTunes in the Cloud, Photo Stream and Documents in the Cloud.

On 17 October Apple said the 4S had sold more than four million units in its first weekend, more than double the iPhone 4's first three days. In the same release it said more than 25 million people were running iOS 5 within five days and more than 20 million had signed up for iCloud. Device, operating system and cloud service arrived in the same week, and Apple presented them as one launch.

What was actually first

Talking to a phone was not new in 2011. The iPhone itself had offered Voice Control since the iPhone 3GS in 2009, letting owners dial by name or play music by voice. Calling the 4S "the first voice assistant" is wrong.

What was first was shipping free-form, conversational requests as a standard feature of a mass-market smartphone — a phone that sold more than four million units in a single weekend. The scale is what made it matter.

Siri would spend the next decade being described as a feature Apple shipped first and then fell behind on. Its generative-AI rebuild was announced in 2024 as part of Apple Intelligence; how that rollout went is covered on the macOS Sequoia and Apple Intelligence page.

For the product line as a whole see iPhone; for the company, Apple; for the man, Steve Jobs.