https://www.cnet.com/news/sprint-gets-even-cheaper-with-promotional-15-unlimited-data-plan/

Sprint is bringing a new low to the unlimited data plan. And in this competitive market, that's saying something. 

The nation's fourth-largest wireless carrier, which has a deal to merge with No. 3 T-Mobile later this year, on Thursday introduced a new unlimited data plan for $15 a month per line. The limited promotion, which is only available online or by phone, kicks off on Friday and lasts for an unspecified limited time. Allan Samson, senior vice president of acquisition for Sprint, said in an interview that this would "last weeks, not months."