T-Mobile US Business CMO Mo Katibeh Exits After Three Years

T-Mobile US has lost the chief marketing officer of its business unit, with Mo Katibeh announcing his departure after nearly three years as EVP and CMO of T-Mobile for Business.

Katibeh confirmed the exit in a LinkedIn post rather than through a company announcement. He stated that Michael Lubunski, formerly VP of business marketing and strategy, would take on leadership of T-Mobile for Business product, marketing and operations. A T-Mobile representative told Mobile World Live that Lubunski's formal title is SVP, business marketing and product for T-Mobile for Business.

Who is leaving, and who replaces him?

Katibeh joined the operator in April 2024 after a two-decade executive career at rival AT&T. Between the AT&T years and T-Mobile, he spent nearly two years as COO and president of cloud platform company RingCentral — roughly one year in each of those two senior posts before moving across to the operator side.

The succession keeps a familiar pairing in place. Lubunski served as RingCentral's chief data officer during Katibeh's time there, so the new SVP is a known quantity to the outgoing CMO rather than an external hire.

Katibeh reflected on the move in his post. "I can honestly say it's been some of the best and happiest years in my professional life," he wrote. "I'm incredibly proud of what our T-Mobile for Business team has accomplished."

What shipped on Katibeh's watch?

His tenure coincided with a run of enterprise-facing launches that T-Mobile has leaned on to differentiate its 5G offer for business customers:

• T-Priority, a network offer aimed at first responders and emergency services
• SuperMobile, network slicing built for business customers
• SuperBroadband, a broadband push built in part on Starlink and fibre joint venture deals
• ANS Edge Control, an edge platform unveiled on the operator's 5G network

For enterprise buyers, the portfolio matters because it moves the pitch beyond connectivity alone — slicing, edge compute and fixed broadband bundles change what a carrier account can deliver against wired rivals.

How does this fit T-Mobile's broader leadership changes?

The exit is the second senior business-side departure at T-Mobile in recent months, not an isolated event. In July, the operator revealed that chief business and product officer Mike Katz had stepped down, with Katz staying in an advisory role until December.

At the same time as the Katz announcement, T-Mobile appointed former AT&T executive Chris Sambar as chief enterprise officer. Sambar's arrival, combined with Katibeh's exit and Lubunski's promotion, means the enterprise unit now operates under a substantially reshaped leadership team — one weighted toward executives with AT&T backgrounds.

What changes for practitioners?

For T-Mobile's business customers and channel partners, the immediate read is continuity in execution: Lubunski inherits the same product and marketing remit and worked alongside Katibeh at both RingCentral and T-Mobile, so a strategy pivot looks unlikely in the near term. The bigger question sits above him — how chief enterprise officer Chris Sambar assembles his leadership bench, and whether further moves follow before Katz's advisory role formally ends in December.