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…