Setup iMessage

Step 1 :
 Go to Settings and tap Messages.
 Turn on iMessage and tap “Use your Apple ID for iMessage.”

Step 2:

Enter your Apple ID and password.

Tap “Sign In”

Any phone number and all email addresses associated with your Apple ID will be displayed.

Note: A phone number will be displayed only if you are setting up your iPhone, or if you are setting up another iOS device after you’ve set up your iPhone

Tap Next.

Step 3:

Tap Send & Receive.

Choose which email addresses and phone numbers you want people to use to send you messages.

Under “Start new conversations from,” choose the email address or phone number you’d like to use to send outgoing messages.

If you’ve already set up other devices for Messages, they’ll alert you that a new device has been set up for Messages.

Note: iPhone screens shown. iPad and iPod touch screens have the same options shown but differ in appearance.

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iMessage

iMessage allows users to send texts, documents, photos, videos, contact information, and group messages over Wi-Fi, 3G or LTE to other iOS or OS X users, thus providing an alternative to standard SMS/MMS messaging for all users with devices running iOS 5 or later.

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, and, additionally, iPhone owners will have registered their phone numbers with Apple. For iPhone users who have an active data connection, Messages will check with Apple if the recipient has iMessage set up. If they do, it will seamlessly transition from SMS to iMessage.

In Messages, 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. iMessage-specific functions operate only between machines running iOS 5 or later or running Mountain Lion or later, but, on the iPhone, Messages can use SMS to communicate with non-iOS devices, or with other iPhones when iMessage is unavailable.[6] On iPhones, green buttons and text bubbles indicate SMS-based communication; on all iOS devices, blue buttons and text bubbles indicate iMessage communication.

All iMessages are encrypted and can be tracked using delivery receipts.[7] If the recipient enables Read Receipts, the sender will be able to see that the recipient has read the message.

iMessage also allows users to set up chats with more than two people - a "group chat".

iMessage is very similar to MMS: it not only allows the user to send plain text, but also allows the user to send pictures, movies, locations, and contacts.

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