The U.S. carrier has launched a nationwide campaign to promote its latest service, which offers customers unlimited domestic calls over a broadband connection with their landline phones.

The move looks pretty strange for a company that has been promoting mobile phones over landline services, but in fact, T-Mobile is targeting those people who are not willing to give up their home phones for wireless services.

What the “@Home” service does is let customers keep their home phone number, while letting them enjoy unlimited nationwide calling for $10 a month.

As the competition gets tougher on the wireless market, T-Mobile is trying to put the competition behind by winning over customers that wouldn’t normally give up their home-phone service for a wireless deal.

This isn’t T-Mobile’s first initiative into the home phone service market. Last year, the U.S. carrier initiated a service called “Hotspot @Home” that allowed cell-phones to use a home Wi-Fi connection for calls instead of the wireless network.

T-Mobile has already created an advantage by offering the lowest price plan available on the market today, putting Vonage behind.

The service has already undergone a testing period in Dallas and Seattle starting February this year, and as Joe Sims, general manager and vice president of T-Mobile, told CNNMoney, the tests ended successfully.

The “@Home” service requires a router with Wi-Fi capabilities that is compatible with all phones. The router will direct the phone calls to the network through the customer’s Internet access.

Not only that, but the router is also compatible with T-Mobile’s “Hotspot @Home” service.

T-Mobile currently has over 30 million subscribers in the United States, and through the new service is hoping to not only strengthen their position on the market, but also respond to customer demands and why not, make some of the most reluctant ones change their mind.