The disconnect appears to be related to a T-Mobile promotion that BlackBerry took issue with last month.
In a blog post in February, BlackBerry CEO and Executive Chair John Chen said that T-Mobile had emailed an offer targeting BlackBerry users on its network asking them to switch their BlackBerry devices to a competitor's smartphone.
Chen said that BlackBerry had not been told of T-Mobile's plans in advance and thanked its customers for expressing their displeasure. Chen told its customers that BlackBerry was upset about the offer and that T-Mobile hadn't spoken with the Canadian company before or after launching the promotion.
Once the deal ends, BlackBerry customers on the T-Mobile network shouldn't see any change in their service or support, Blackberry said.
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BlackBerry Ltd., formerly known as Research In Motion, said that it will work with T-Mobile to help any BlackBerry customers remaining on the T-Mobile US network or any customers buying devices from T-Mobile's existing inventory.
BlackBerry said it's also working with its other carrier partners to give its customers options should they want to switch to another carrier.
Chen said in a statement that the company hopes to work with T-Mobile again when their business strategies align.
The BlackBerry has also been hurt by competition from Android-based rivals.
On Friday the company reported mixed fourth-quarter results as its adjusted loss was better than expected, but revenue which dropped below USD 1 billion for the first time since late 2007 fell short of analysts' expectations.