During the registration phase, your phone number is verified by Apple, and a secure key is exchanged between your device and their servers. Activating iMessage on Your Device The registration process is managed entirely through your device settings.
Add Email iMessage Send Receive
Verifying a Successful Setup Once registration is complete, the interface within the Messages app will change subtly. Activation synchronizes your Apple ID with your phone number or email address, telling Apple’s servers that you are ready to send and receive encrypted messages over the internet.
When you message another Apple user, the text bubble background will shift from green to blue, and the "Delivered" status will appear under the timestamp. If you are using a Mac, you will need OS X Mountain Lion or later to access iMessage on your computer.
How to Add an Email for iMessage Send and Receive
Unlike standard text messages, iMessage uses your data connection to send texts, photos, videos, and documents without consuming traditional SMS allowances. Finally, ensure that your device is not blocked from communicating with Apple’s servers due to a firewall or carrier restriction.
More About How to register in imessage
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