BlackBerry is still trying to turn its business around, but it has apparently decided that the US' smallest major network operator is not essential to those plans. The company has announced that it will not be renewing T-Mobile's BlackBerry licensing agreement and that T-Mobile will no longer be able to sell BlackBerry products when the current agreement lapses on April 25. BlackBerry users already on the T-Mobile network should continue to receive service and support for the foreseeable future.

“BlackBerry has had a positive relationship with T-Mobile for many years," wrote BlackBerry CEO John Chen. "Regretfully, at this time, our strategies are not complementary and we must act in the best interest of our BlackBerry customers. We hope to work with T-Mobile again in the future when our business strategies are aligned.”

While neither company has given a more specific reason for the breakup, the news comes just a few weeks after a high-profile spat between Chen and outspoken T-Mobile CEO John Legere. In February, T-Mobile began running an ad offering BlackBerry users $0 down on an iPhone 5S—CrackBerry has saved a screenshot for posterity. Chen blasted the ads in an official BlackBerry blog post, saying that the company was "outraged" and calling the ads "inappropriate and ill-conceived." Legere responded by suggesting that Chen would prefer using MySpace to Twitter, a less-than-subtle reference to BlackBerry's status and an unflattering insult if we've ever read one.

Though it's newsworthy that a major US carrier will no longer be carrying BlackBerry's handsets, it's unlikely that the move will do much damage to T-Mobile's or BlackBerry's business. After all, both companies have one thing in common: they're both in fourth place in their respective markets, limiting the impact to either company's bottom line.