Comcast is testing data caps for its broadband internet customers that would limit them to 300 GB of data per month, according to The Times Leader. Comcast has started open trials of its home broadband data caps in several large markets around the country. Here are all the regions affected: Mobile, Alabama Huntsville, Alabama Tuscon, Arizona Atlanta, Georgia Augusta, Georgia Savannah, Georgia Jackson, Mississippi Charleston, South Carolina Knoxville, Tennessee Memphis, Tennessee All of central Kentucky The entire state of Maine