iMessage allows users to send texts, documents, photos, videos, contact information, and group messages over the Internet to other iOS or macOS users. iMessage is an alternative to the SMS and MMS messaging for most users with devices running iOS 5 or later. The "Send as SMS" setting under Messages will cause the message to be sent via SMS if the sender does not have an active Internet connection. If the receiver has no Internet connection, the message should be stored on a server until a connection is restored.
On October 23, 2012, Apple CEO, Tim Cook announced that Apple device users have sent 300 billion messages using iMessage and that Apple delivers an average of 28,000 messages per second. In February 2016, Eddy Cue announced that the number of iMessages sent per second had grown to 200,000.
On August 7, 2019, researchers from Project Zero presented 6 “interaction-less” exploits in iMessage that could be used to take over control of a user’s device. These six exploits have been fixed in iOS 12.4, released on July 22, 2019, however there are still some undisclosed exploits which will be patched in a future update.
On June 13, 2016, Apple announced the addition of Apps to iMessage service, accessible via the Messages apps. Apps can create and share content, add stickers, make payments, and more within iMessage conversations without having to switch to standalone apps. One could develop standalone iMessage apps or an extension to existing iOS apps. Publishers can also create standalone stickers apps without writing any code. According to Sensor Tower, as of March 2017 the iMessage App Store features nearly 5,000 Message-enabled apps.
The iMessage protocol is based on the Apple Push Notification service (APNs)—a proprietary, binary protocol. It sets up a Keep-Alive connection with the Apple servers. Every connection has its own unique code, which acts as an identifier for the route that should be used to send a message to a specific device. The connection is encrypted with TLS using a client-side certificate, that is requested by the device on the activation of iMessage.
iMessage is accessible through the Messages app on an iPhone, iPad or iPod touch running iOS 5 or later, or on a Mac running OS X Mountain Lion or later. Owners of these devices can register one or more email addresses with Apple. Additionally, iPhone owners can register their phone numbers with Apple, provided their carrier is supported. When a message is sent to a mobile number, Messages will check with Apple if the mobile number is set up for iMessage. If it is not, the message will seamlessly transition from iMessage to SMS.
On May 3, 2016, an independent open-source project named "PieMessage" was announced by app developer Eric Chee, consisting of code for OS X that communicates with iMessage and connects to an Android client, allowing the Android client to send and receive messages.
On March 21, 2016, a group of researchers from Johns Hopkins University published a report in which they demonstrated that an attacker in possession of iMessage ciphertexts could potentially decrypt photos and videos that had been sent via the service. The researchers published their findings after the vulnerability had been patched by Apple.
In May 2014, a lawsuit was filed against Apple over an issue that, if a user switches from an Apple device to a non-Apple device, messages being delivered to them through iMessage would not reach their destination. In November 2014 Apple addressed this problem by providing instructions and an online tool to deregister iMessage. A federal court dismissed the suit in Apple's favor.
iMessage is an instant messaging service developed by Apple Inc. Launched in 2011, it is supported by the Messages application in iOS 5 and later and OS X Mountain Lion and later.
All iMessages are encrypted and can be tracked using delivery receipts. If the recipient enables Read Receipts, the sender will be able to see when the recipient has read the message. iMessage also allows users to set up chats with more than two people—a "group chat".
In 2017, Google announced they would compete with iMessage with their own messaging service, Android Messaging.
On November 4, 2014, the Electronic Frontier Foundation (EFF) listed iMessage on its "Secure Messaging Scorecard", giving it a score of 5 out of 7 points. It received points for having communications encrypted in transit, having communications encrypted with keys the provider doesn't have access to (end-to-end encryption), having past communications secure if the keys are stolen (forward secrecy), having their security designs well-documented, and having a recent independent security audit. It missed points because users can not verify contacts' identities and because the source code is not open to independent review. In September 2015, Matthew Green noted that, because iMessage does not display key fingerprints for out-of-band verification, users are unable to verify that a man-in-the-middle attack has not occurred. The post also noted that iMessage uses RSA key exchange. This means that, as opposed to what EFF's scorecard claims, iMessage does not feature forward secrecy.
In Messages, the user's sent communication is aligned to the right, with replies from other people on the left. A user can see if the other iMessage user is typing a message. A pale gray ellipsis appears in the text bubble of the other user when a reply is started. It is also possible to start a conversation on one iOS device and continue it on another. On iPhones, green buttons and text bubbles indicate SMS-based communication; on all iOS devices, blue buttons and text bubbles indicate iMessage communication.
iMessage was announced by Scott Forstall at the WWDC 2011 keynote on June 6, 2011. A version of the Messages app for iOS with support for iMessage was included in the iOS 5 update on October 12, 2011. On February 16, 2012, Apple announced that a new Messages app replacing iChat would be part of OS X Mountain Lion. Mountain Lion was released on July 25, 2012.
"That an Humble Address be presented to Her Majesty, that she will be graciously pleased to direct Ministers to lay before this House, not later than 11.00pm Wednesday 11 September, all correspondence and other communications (whether formal or informal, in both written and electronic form, including but not limited to messaging services including WhatsApp, Telegram, Signal, Facebook messenger, private email accounts both encrypted and unencrypted, text messaging and iMessage and the use of both official and personal mobile phones) to, from or within the present administration, since 23 July 2019 relating to the prorogation of Parliament sent or received by one or more of the following individuals: Hugh Bennett, Simon Burton, Dominic Cummings, Nikki da Costa, Tom Irven, Sir Roy Stone, Christopher James, Lee Cain or Beatrice Timpson; and that Ministers be further directed to lay before this House no later than 11.00pm Wednesday 11 September all the documents prepared within Her Majesty's Government since 23 July 2019 relating to operation Yellowhammer and submitted to the Cabinet or a Cabinet Committee."
The new technologies developed for VIP Art Fair are the most significant changes for VIP 2.0. First, the site is now integrated with social media sites like Facebook and Twitter – enabling visitors to build personalized tours on the Fair site then share them on their social media pages. Next, the site now supports all web-browsers, iPad and other mobile devices. Finally, the chat feature on the site has been improved, using cloud technology, and expanded so that it can now be used on mobile phones – functioning like iMessage or BBM. The world’s leading contemporary galleries have participated in VIP 2.0, including David Zwirner (New York), Galerie Max Hetzler (Berlin), White Cube (London), Gagosian Gallery (New York, London, Beverly Hills, Rome, and Athens), Hauser & Wirth (Zürich, London, and New York), Anna Schwartz Gallery (Melbourne and Sydney), Xavier Hufkens (Brussels), Fraenkel Gallery (San Francisco), and James Cohan Gallery (New York and Shanghai).
The first retrial, conducted Sept 26-Sept 30, 2016 resulted in another unanimous jury verdict for VirnetX. The verdict re-affirmed patent violations enabling Facetime and iMessage and awarded $439.7 million to VirnetX. The remaining 2 patents will be tried separately
The mobile version of Messages on iOS used on iPhone and iPad also supports SMS and MMS due to replacing the older text messaging Text app since iPhone OS 3. Users can tell the difference between a message sent via SMS and one sent over iMessage as the bubbles will appear either green (SMS) or blue (iMessage).
To promote the release of the full version of the game, The Pokémon Company released a free promotional eBook called Detective Pikachu Episode 0 - Eevee's Case, available until May 15, 2018 on Apple's iBooks and Amazon's Kindle stores. The short story acts as a prequel to the game, setting up its story. The book was originally released in physical form as a pre-order bonus for the game in Japan. Alongside this, a set of stickers was also released for free on iMessage and Line on the same day.