iMessage enables clients to send writings, archives, photographs, recordings, contact data, and gathering messages over Wi-Fi, cell phone Internet get to, or different types of Internet access to different iOS or macOS clients, in this manner giving an other option to standard SMS/MMS informing for most clients with gadgets running iOS 5 or later.

iMessage is open through the Messages application on an iPhone, iPad or iPod touch running iOS 5 or later or on a Mac running OS X Mountain Lion or later. Proprietors of these gadgets can enroll at least one email addresses with Apple, and, also, iPhone proprietors can enlist their telephone numbers with Apple, gave their transporter is bolstered. At the point when a message is sent to a portable number, Messages will check with Apple if the versatile number is set up for iMessage. On the off chance that it isn't, the message will flawlessly progress from iMessage to SMS.

In Messages, the client's sent correspondence is adjusted to one side, with answers from other individuals on the left. A client can check whether the other iMessage client is writing a message, pale dark ellipsis shows up in the content rise of the other client when an answer is begun. It is additionally conceivable to begin a discussion on one iOS gadget and proceed with it on another. iMessage-particular capacities work just between machines running iOS 5 or later or running Mountain Lion or later, at the same time, on the iPhone, Messages can utilize SMS to speak with non-iOS gadgets, or with different iPhones when iMessage is unavailable.[17] On iPhones, green catches and content air pockets show SMS-based correspondence; on all iOS gadgets, blue catches and content air pockets demonstrate iMessage correspondence.

All iMessages are encoded and can be followed utilizing conveyance receipts.[18] If the beneficiary empowers Read Receipts, the sender will have the capacity to see when the beneficiary has perused the message. iMessage likewise enables clients to set up visits with in excess of two individuals—a "gathering talk".

With the dispatch of the iOS10, clients can send messages joined by a scope of "air pocket" or "screen" impacts. By holding down the send catch with constrain, the scope of impacts is surfaced for clients to choose an impact to be sent to the recipient.

On the off chance that the journalists' iPhones are running iOS 5 or later and have an information association, iMessage will send the clients' messages by means of the clients' information association rather than through SMS/MMS. This implies if a client sends an instant message to another iOS 5 client, there is no SMS/MMS accuse related of the message. It is only regarded as an extra information exchange.

The "Send as SMS" setting under Messages will make the message be sent by means of SMS if the sender does not have an information association. This alternative is free of the recipient's information association status. On the off chance that the recipient has no information association, the message ought to be put away on a server until the point when an association is reestablished.

As indicated by Sensor Tower, as of March 2017 the iMessage App Store includes about 5,000 Message-empowered applications.
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