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How to use imessage for the US version of iphone4s mobile phone number?

Iphone4s uses imessage as follows:

Step 1: Click the "Settings" icon on the desktop.

Step 2: Open "imessage".

Step 3: Enter your Apple account and click the "Login" option.

Step 4: After system verification, it shows that iMessage has been activated and turned on.

Step 5: Click the "imessage" icon on the desktop.

Step 6: Click the blue plus icon in the upper right corner to open the address book on the iphone4s, and select the contact who wants to send iMesaage.

Step 7: Enter the information content and click Send.