You can use the Messages app on your iPhone, iPad, or iPod touch to send messages. Those messages are sent as iMessage or SMS/MMS. Learn more about the difference between the message types.
Both Gmail and Inbox by Gmail are official Google apps that allow you to send and receive Gmail messages on your iPhone. The main difference between the two apps is that you can set up non-Gmail accounts in the Inbox app. Navigate to the app’s Menu bar, click Messages, and then select Preferences. Select the iMessage tab in the pop-up panel. Enable your account if needed. Enable Messages in iCloud if.
iMessage
iMessages are texts, photos, or videos that you send to another iPhone, iPad, iPod touch, or Mac over Wi-Fi or cellular-data networks. These messages are always encrypted and appear in blue text bubbles. To turn iMessage on or off, go to Settings > Messages.
SMS/MMS
If you aren’t using iMessage, you can use SMS/MMS. These messages are texts and photos that you send to other cell phones or another iPhone, iPad, or iPod touch. SMS/MMS messages aren't encrypted and appear in green text bubbles on your device.
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To use SMS/MMS on an iPhone, you need a text-messaging plan. Contact your wireless carrier for more information. You can also set up your other Apple devices to send and receive messages from any Apple device.
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If Wi-Fi is unavailable, iMessages will be sent over cellular data. Cellular data rates might apply.