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AutoCAD 360 is a free app that allows you to open and view DWG files on your iOS, Android, or Windows device.  iOS users are instructed to download AutoCAD 360 from the App Store or iTunes, while Android users are instructed to download the app from Google Play Store.  AutoCAD 360 will automatically open and display the DWG file in its viewer. If the DWG file is stored to Dropbox, Box, or Egnyte: Click on the sidebar menu, select “Connect” under Actions, sign into your account, then select the DWG file you want opened. The server address must be https://dav.box.com/dav for Box accounts

Summary:
Navigate to the AutoCAD 360 downloads page on the AutoDesk website at https://www.autocad360.com/free-cad-software/. Select the option to download AutoCAD 360 for your computer or device. Download and install AutoCAD 360 to your device like you would any other app. Launch AutoCAD 360 on your device when installation is complete. Select the DWG file you want opened.