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Sprint(s s) was the last of the four major U.S. carriers to launch an early upgrade program. And now, less than four months after One Up was first introduced, the program has quietly come to an end. All traffic to Sprint’s One Up page is now directed to a support page that says One Up was retired on January 9 and points you in the direction of Sprint’s new Framily plans.

Given that Sprint’s Framily plans were just launched on January 7, it appears that Sprint’s decision to shutter the One Up program came about somewhat abruptly just two days later. When my colleague Kevin Fitchard first reported on the new Framily plans last week, Sprint had already figured out a way for those new plans and One-Up to work together.

This means that Sprint, unlike competitors AT&T(s), T-Mobile(s tmus) and Verizon(s vz), no longer offers the option for an early upgrade unless you’re signed up for unlimited data. I reached out to the company for more information, but was only told, “Sprint continues to offer customers an upgrade option with the Sprint Framily plan. For $20 per month, customers can buy up to unlimited data and the ability to upgrade their device every 12 months.” That leads me to believe there are no plans to replace One Up with a similar program.

If you already signed up for the One Up program prior to January 9, you’ll be able to keep your $15 monthly discount on unlimited service, but only until your next device upgrade or plan change.

This post was updated at 9:15am with a statement from Sprint.