The company said it expects to "recover lost ground in the third quarter" with new products and better marketing to battle its rivals.
The OnePlus 2 has a sleek design and runs its own Android 5.1-based OxygenOS operating system, which is designed to provide deeper customization for users.
The Moto X Style, the Moto X Play and the updated Moto G all aim at different markets and price targets to attract new buyers.
The Samsung Unpacked event will be held in New York City as the company seeks to gain brash attention for its latest smartphones.
As it adds more customers, T-Mobile is trying to bulk up its IT staff in Seattle, where it is seeking skilled workers in software, systems and more.
T-Mobile customers can choose from a waterproof Kyocera smartphone, two Samsung phones, an HTC Desire 626 phone and an Alcatel 7-inch tablet.
A vulnerability in the Stagefright media library used in Android remains unpatched in 95 percent of devices months after first being reported by Zimperium.
Facebook, Google, HP, Dell, eBay and others enter a "friend of the court" brief to support Samsung in its ongoing patent war with Apple.
The new smartwatch is also available at Pebble.com online immediately or in Target stores or at Target.com during the week of Aug. 17.