With iMessage, you can send unlimited text messages via WiFi or the EE network from an iPad with Retina display to anyone with an iPad, iPhone or iPod touch.
iMessage is built into the Messages app, so you can send text, photos, videos, locations and contacts. You can also keep all your mates in the loop with group messaging, track your messages with delivery receipts and optional read receipts, and see when someone's typing a message to you.
You also get the option of securely encrypting your text messages.
And you can even start a conversation on your iPad with Retina display and then pick up where you left off on another iOS device.
Here's how to set up iMessage on an iPad with Retina display
First, enter your Apple ID and password in Settings > Messages.
(You can also turn on Send as SMS to use your wireless messaging plan to send messages when iMessage isn't available.)
In the Messages app's text field, your iPad with Retina display will tell you which messaging service you're using.
When you use your wireless messaging plan, the contact name and the Send button are green. The text field also says Text Message instead of iMessage. If you send via iMessage they'll turn blue, and iMessage will appear in the text field.
When you turn on Send Read Receipts in Settings > Messages, you can see when recipients read your messages.
Ellipsis points (a series of full stops) will appear when the other person is typing a reply.
You can also select multiple contacts to use group messaging with iMessage.
Please note: iMessage uses both the EE network and WiFi connections to send and receive messages, but those messages don't count toward the messages in your wireless plan.