If you’re an AT&T Mobility customer, we have some good news for you. Changes coming on Sunday, Dec. 8, could actually save some customers money.

The company’s recently announced “Mobile Share Value” plans could mean savings averaging $15 per month. To qualify for the discount, users must transfer their current device to AT&T, buy a handset without a subsidy, or have their current contract expire. The savings also apply to customers who finance their new smartphone purchases through AT&T’s Next plan.

Customers will also have to subscribe to one of AT&T’s Mobile Share plans, which offer shared data among a group of subscribers. Currently, these plans are limited to 10 devices for consumers, and 25 for businesses.

Before the Mobile Share Value plans were announced, customers paid the same monthly rates, no matter the circumstance.

The second largest carrier in the U.S. has also announced a new 18-month upgrade option. The plan is available to consumers for up to four smartphones, and to select small business customers, who may provide employees with up to six company-owned devices.

The new plan, which also launches on Dec. 8, spreads payments over 26 months. It gives customers the opportunity to upgrade after 18 monthly payments without a down payment, upgrade fee, activation free, or financing fee.

According to David Christopher, chief marketing officer, AT&T Mobility:

With our new Mobile Share Value Plans, customers don’t have to compromise. Our new no contract option lets customers add a smartphone to the nation’s fastest and most reliable 4G LTE network at a lower monthly cost. Customers want great value and a premium network – and now they can save more and get unlimited talk, text and data to share.

Both of these plans are good news — at least for certain customers. Of course, the devil will be in the details. We’ll continue to follow this story and keep you informed when we hear more. In the meantime, you can learn more about AT&T’s Mobile Share Value plans by visiting att.com/mobilesharevalue.

See also: British Carrier 3 Kick-Starts Its 4G LTE Rollout, Adds Free Roaming In The United States, and Apple Finally Signs iPhone Partnership Deal With China Mobile, Reports WSJ.