This paper summarizes the development of goBIM, a model viewer, markup, and data-querying environment that utilizes Appleis iPhone and Autodeskis Revit software. Geometric and database information are written to a user defined server location via a custom Revit plugin. Model geometry and database information are loaded at run-time from the web server to the goBIM iPhone application, using a cellular network connection or WiFi. The user can then navigate the 3D environment, selecting objects to view their associated database information. The user has the ability to tag elements in the model with additional data, which can then be pushed back to the server and reloaded in the local version of the Revit model. BIM data can now be accessed anywhere there is a WiFi or cellular network connection available.