https://www.cnet.com/news/sprints-crazy-low-15-unlimited-plan-is-going-away-on-friday/

Sprint's latest deal was too good to last. But it's surprising just how quickly it's going away. 

A week ago, the nation's fourth-largest wireless carrier introduced a promotional $15 unlimited data plan, with few strings, and no plans to ever see a price increase. That dirt-cheap price wasn't feasible in the long term, and Sprint is shutting it down. The promotion will last until 8:59 p.m. PT/11:59 p.m. ET on Friday.