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SMS or MMS messages on your Mac if your iPhone (with iOS 8.1 or later) is signed in to Messages with the same Apple ID. On your iPhone, go to Settings > Messages, tap Text Message Forwarding, then tap the name of your Mac to turn on Text Message Forwarding. On your Mac, you’ll see an activation code if you’re not using two-factor authentication for your Apple ID. Enter the code on your iPhone, then tap Allow.
Ask Siri. Say something like: “Message Mom that I’ll be late.”
Keep favorite conversations at the top. Pin your favorite conversations to the top of the messages list by dragging them to the top. New messages, Tapbacks, and typing indicators appear above a pinned conversation. When there are unread messages in a group conversation, the most recent participants appear around the pinned conversation.
Send Memoji stickers. Messages automatically generates sticker packs based on your Memoji characters. To add a Memoji sticker to a conversation, click the Apps button 
, click Memoji Stickers, click the New Memoji button 
or Video button 
.
Learn more. See the Messages User Guide.