Verizon recently announced a shake-up at its Oath media subsidiary.

Vanessa Wittman, formerly of Dropbox, Motorola and Marsh & McLennan, was named CFO and will work with CEO Tim Armstrong to accelerate the company's expansion. She replaces Holly Hess, who assumed a new position to implement Verizon's $10 billion cost savings initiative.

“Vanessa is an exceptional leader with singular experience, and she will be a great partner to help drive Oath's vision, strategy and operations to reach our long term goals,” Armstrong said in a statement.

Ultra Mobile this month outlined a new plan structure that expands its unlimited calling feature to 15 additional countries.

The MVNO, which operates on T-Mobile's network, said in a statement that all plans include unlimited talk to at least 75 countries, along with unlimited global texting and 4G LTE data. The operator also said international call credits in multi-month bonuses allow for increased long-distance overseas calls.

"Our customers are constantly communicating with friends and families in more ways and destinations than ever before," said Ultra Mobile President Tyler Leshney. "The updates to our current plans help our brand and service stand out amongst the congestion of the wireless industry.”

Sprint will partner with National Geographic on a "Chasing Genius" challenge aimed at advancing next-generation networks and expanding wireless connectivity.

Participants will submit one-minute videos detailing their idea, with the winner securing a $25,000 prize to develop the concept.

“Imagine a world where everyone, no matter their background or where they live, has access to high-speed, affordable connectivity,” said Sprint CTO John Saw. "That’s what this is all about."