AT&T makes 30 upgrades to networks in Duluth

AT&T has made more than 30 upgrades to wireless networks in Duluth.

This is their largest investment announcement since 2013.

The improvements add better capacity to cellular sites in the area. This will give people faster service which they hope will allow customers have a better experience.

The investment represents $375 million that AT&T has invested in Minnesota over the last three years.