Just four months after Sprint’s “One Up” program was introduced, the carrier has quietly killed the initiative. Introduced as a delayed response to T-Mobile’s Uncarrier 2.0 effort dubbed “Jump,” One Up allowed Sprint subscribers to upgrade their smartphones long before their contracts expired when trading in their current working handsets. Alongside the rollout of its new “Framily” plans last week, however, Sprint quietly killed its One Up program. The carrier has yet to discuss exactly why One Up was killed so quickly, but the new Framily plans with unlimited data include a similar option where subscribers can upgrade their smartphones once per year.