Comcast Internet customers in Nashville now have the chance to upgrade to gigabit speeds.

The provider's DOCSIS 3.1 Internet service, which delivers gigabit-like speeds without major installation hassles, rolled out in Atlanta in March, and is now available in Nashville. It's scheduled to hit Chicago, Detroit, and Miami in the second half of the year.

DOCSIS 3.1 runs through standard cable connections already in place at your home or office; no fiber installation necessary. Just sign up for a plan and plug in a new modem.

Nashville customers must be selected to receive gigabit speeds, however. New and existing customers can visit Xfinity.com/gig to get in line; Comcast will then choose certain customers to participate in the Nashville trial. "These initial users will also be encouraged to give Comcast feedback about their service, which will be used to help ensure future market rollouts deliver the best possible customer experience," Comcast says.

Initial customers will have the choice of a promotional contract price of $70 per month for 36 months or $139.95 per month with no contract.

"We're delivering on our promise to make Nashville customers among the first in the world to enjoy this new Gigabit technology," Comcast's regional senior vice president, Doug Guthrie, said in a statement. "The capabilities of DOCSIS 3.1 are incredibly exciting, and we are proud to be the first to market with a Gigabit offering that runs over our existing cable infrastructure."

Comcast's Gigabit Pro service, meanwhile, uses fiber to provide speeds up to 2 gigabit per second. Launched last year in Atlanta, the program will reach Chicago, Detroit, Miami, Nashville, and several other markets. It is currently available to 18 million homes, but costs about $230 per month.