SMS (text) messages can be accessed by clicking on the "Messages" button in the top header.
From the window that pops up, you can access your chat history and send and receive messages inside existing conversations.
You can't start a new conversation from this screen yet, but this feature will be available soon. For now, if you want to initiate a new conversation, you can head over to the "SMS Campaigns" section from the left-side menu.
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