Download and install the AT&T Landline Texting desktop application for Mac OS
1. Open a browser and navigate to https://landlinetexting.att.com/apps.
2. Under “Desktop”, click the “Mac” link.
3. When the download completes, open the ATT_Landline_Texting.dmg file.
4. Move AT&T Landline Texting to your system’s Applications folder.
5. Open the desktop application.
6. The AT&T Landline Texting Log In dialog box appears.