Four towns and four highway corridors can now access AT&T's 4G LTE network.
The service is available in Potsdam, Canton, Colton Norwood and along state routes 11, 56, 310 and 345.
4G LTE is a high-speed wireless internet data connection for devices such as smartphones and tablets. It allows for faster-than-average web browsing, streaming, uploads and downloads.
4G LTE service is now available in most of northern and central St. Lawrence County.
The company recently announced launching the service in Ogdensburg, Massena, Lisbon, Norfolk, Rensselaer Falls, Waddington and along state routes 37, 56 and 812.
Verizon has offered 4G service in some areas of St. Lawrence County since 2013.