Apple's operating system accounted for 50 percent of all US activations in the fourth quarter, inching out Android's 45 percent share.
A check of US phone users by Consumer Intelligence Research Partners found that iPhones accounted for half of all activations.
The company expects a pretax loss due to changes in pension and post-employment plans and abandonment of certain copper assets.
Decline in quarter would mark fifth consecutive quarterly drop for the world's largest maker of smartphones.
The NSA whistleblower tells NBC the US government has decided "all of our data can now be collected without any suspicion of wrongdoing."
Most of AT&T's customer gains in the fourth quarter came from its non-smartphone business.
The rivals tie for the top spot in the fourth quarter of 2014, with Apple's fortunes on the rise and Samsung's heading in the opposite direction, according to figures from researcher Strategy Analytics.
New data shows the company's market share rose to 7 percent -- and that's even before the China Mobile deal.
The company's fourth-gen camera has one of the most compact designs we've seen, built with components and features that raise it above your average action cam.
A fourth-quarter jump in the customer turnover rate underscores the increasingly volatile environment for wireless carriers that even Verizon can no longer avoid.