Uh oh, new BlackBerry CEO John Chen is not happy about a T-Mobile campaign trying to tempt BlackBerry users onto its network with the offer of an iPhone.

T-Mobile US Inc. sent out the offer last week. BlackBerry 's CEO has responded in the form of an irate-sounding blog on the company site. (See BlackBerry Shakes Up Its C-Level.)

Chen writes that Blackberry was "outraged" by the offer and puzzled that T-Mobile didn't speak to them about it before launching the campaign:

T-Mobile's rambunctious CEO also reacted to the user response. On Saturday, he tweeted: "BlackBerry users, I'm hearing you loud and clear." (See Is SoftBank Ready to Reunite With Legere?)

Legere later added that T-Mobile will "continue to support" BlackBerry.

Chen, however, is clearly not happy with the operator. "Finally, to T-Mobile, I would like to remind you that our long-standing partnership was once productive and profitable for both BlackBerry and T-Mobile," he wrote as a end salvo to the blog. "I hope we can find a way forward that allows us to serve our shared customers once again."

— Dan Jones, Mobile Editor, Light Reading