Comcast has introduced a new wireless service, Xfinity Mobile, with an unlimited plan priced at $45 a month per line.

According to a news release, Xfinity Mobile runs on America's largest, most reliable 4G LTE network — which is Verizon — and uses Comcast's 16 million Wi-Fi hotspots for a better wireless experience.

Customers must have residential Xfinity internet service to take advantage of the mobile deal.

Comcast’s $45/month unlimited cell phone plan

The $45 unlimited talk, text and data plan (reduced speeds after 20 GB) is priced $20 lower than it was initially and has no line access fees for up to five lines. Taxes and fees are extra.

In addition to the unlimited plan, customers who don’t use a lot of data can pay $12 per GB every month. Comcast says customers can switch back-and-forth between the two data options at no cost.

This may seem like a great deal so far, but there’s a downside: You can’t bring your own phone.

“We’re unable to support phones that are purchased independently or through other carriers — we can’t guarantee that they’ll work, and we can’t provide technical support if they don’t,” Comcast’s website states. “The phones that are available through XFINITY Mobile were selected to work optimally with our network, so that we can provide you with the best possible XFINITY Mobile experience.”

Devices available for sale through Xfinity Mobile include the iPhone 7, iPhone 7 Plus and Samsung Galaxy S8 — as well as two under $200 options from LG, X charge and X power.

So, if you’re already happy with your Comcast internet and TV service, this may be something worth checking out.

We have to mention that there are many other cell phone plans in the same price range with more phone options, including Sprint’s $50 a month deal on the first line of unlimited service.

See all of your options in Clark's guide to the best cell phone plans and deals for 2017.