Link my iphone to my mac for imessag

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You can find out which Apple ID this is if you're unsure under your iPhone's Settings App > Messages > Send & Receive.

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You can do this on your Computer's Messages app under the 'Messages' Menu Item > 'Preferences.' > Accounts > '+' Sign into the iMessage account that is your current active iMessage Account on your iPhone. Assuming you have an iPhone running one of the latest builds and a corresponding Mac (up to date):