Updated 10272022-140015
When someone sends you an SMS or MMS message on your iPhone, it appears as a green bubble. iMessages appear as blue bubbles. When you set up Text Message Forwarding, you can send and receive the SMS and MMS messages from your iPhone on any device that meets the Continuity system requirements.
Make sure that you're signed in to iMessage with the same Apple ID on each device:
On your iPhone, go to Settings > Messages > Text Message Forwarding.- Then choose which devices can send and receive text messages from your iPhone. If you're not using two-factor authentication for your Apple ID, a verification code appears on each of your other devices: enter that code on your iPhone.
As long as your iPhone is turned on and connected to Wi-Fi or a cellular network, new SMS/MMS texts can be sent and received on the devices that you added.
iCloud now keeps your entire messages history updated and available on all your devices — even when you set up a new device. Learn how to keep all your messages in iCloud.