Termination of deal follows a series of public spats earlier this year.
BlackBerry has said that it is cutting all ties with carrier T-Mobile in the US, marking the end of a chequered relationship between the two companies.
The troubled Canadian manufacturer today announced that it would not be looking to renew its licence with T-Mobile’s US network following the expiry of its current contract on April 25.
However, BlackBerry has said that it will continue to provide service and support to existing T-Mobile customers or those who buy products from the carrier’s inventory in the future.
"BlackBerry has had a positive relationship with T-Mobile for many years," BlackBerry Chief Executive John Chen said in a statement. "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."
The relationship between the two companies has been strained since February following emails sent from the network offered discounted iPhone 5S devices as "a great offer for BlackBerry customers".
This sparked complaints from many BlackBerry customers and even Chen himself, who criticised the timing of the announcement in a company blog post, saying, "What puzzles me more is that T-Mobile did not speak with us before or after they launched this clearly inappropriate and ill-conceived marketing promotion."
Customers keen to get their hands on BlackBerry’s new Q10 and Z10 handsets were also angered by a new T-Mobile delivery policy concerning the devices, which meant the carrier would no longer post out the devices to customers.
The complaints spurred T-Mobile CEO, John Legere to post on his Twitter feed that he had heard them "loud and clear."
BlackBerry said it is "working closely" with other carrier partners to provide users with alternatives should they decide to switch from T-Mobile.
Recent figures show that BlackBerry’s market share has continued to fall this year in the face of increased competition, especially from Android and Windows Phone devices. The latest report from industry analysts Kantar found the BlackBerry only has 3.4% of the total UK smartphone market.