Anyone who owns both a Mac computer (either laptop or desktop) running macOS Sierra and an iPhone can now—in addition to sending and receiving iMessages—send messages to phones with regular text messages! Set up an account with Apple if you...
Part 1 of 4:
Setting Up Apple ID and iCloud Accounts


Go to this link on your Mac. Alternatively, go to apple.com, scroll to the bottom, and under "Account," click on "Manage Your Apple ID."

Part 2 of 4:
Signing into iCloud on your iPhone and Mac


Part 3 of 4:
Enabling Text Messaging on your Mac

On your Mac, open the "Messages" application.

Click the "Messages" drop down menu at the top of the menu screen. Select "Preferences..."..

Select the "iMessage" option on the left and log in with your Apple ID as shown below. If you haven't previously set up an iMessage account with your "Messages" application, it will be blank.

Customize your settings if you'd like. Once logged in, all default settings you will need will already be checked off. If you want to customize these settings, just make sure that "Enable this account" and your phone number and email address associated with your Apple ID remain checked to ensure text messages will still be able to be sent and received from your account and phone number. Leave this window open for now.
Part 4 of 4:
Enabling Text Messaging on your iPhone

On your iPhone, open "Settings" and from the "Settings" home page, scroll down to "Messages".

Tap on "Messages" and then "Text Message Forwarding".

Under this menu, find the name of your computer and switch it on.

On your Mac, the "Messages" application should now show you a notification providing you with a six-digit verification code. Enter this code on the notification that pops up on your iPhone and tap "Allow".
Congratulations! You will now be able to send and receive the same text messages on your Mac that you send and receive on your iPhone!


Update 04 March 2020
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