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We support our current and future @Blackberry customers! Bring your #BB or upgrade with a great offer. #uncarrier http://t.co/Q3c2m6lpcC — John Legere (@JohnLegere) April 4, 2014

The fourth-largest U.S. wireless carrier will no longer be able to sell new BlackBerry products when the contract ends April 25.

“BlackBerry has had a positive relationship with T-Mobile for many years,” BlackBerry chief executive John Chen said in a statement earlier this week. “Regretfully, at this time, our strategies are not complementary and we must act in the best interest of our BlackBerry customers.”

The public spat between the two companies began in February, after T-Mobile encouraged users in ads to switch to Apple Inc.’s latest high-end smartphone, the iPhone 5S. Mr. Chen fired back, saying he was “outraged” with the carrier’s move.

“As we were never told of their plans in advance, I can only guess that T-Mobile thought its ‘great offer for BlackBerry customers’ would be well received,” Chen wrote in a blog post that month. “T-Mobile could not have been more wrong.”

T-Mobile’s latest peace offering to BlackBerry users can go toward any new device, including the BlackBerry Z10 and Q10, Mr. Legere said. The offer is good through the end of the year.

And it likely won’t be the last we’ll hear from Mr. Legere on BlackBerry, as his letter teased another promotion: “We’ll keep listening to you and finding new ways to meet the needs of BlackBerry users,” he wrote. “Stay tuned for another Un-carrier offer that gives you more value and even more reasons to stay with America’s fastest growing wireless company.”