T-Mobile US detailed a management reshuffle in preparation for the pending departure of two of its big-name bosses.

Ulf Ewaldsson is leaving his role as president of Technology and Callie Field is departing as president of T-Mobile’s Business Group.

In an SEC filing, the operator explained CTO John Saw would replace Ewaldsson. The executive is the former EVP of advanced and emerging technologies and played a key role in developing T-Mobile’s 5G network.

A man in a pink jacket and trousers, wearing a white T-shirt with a magenta logo, stands on stage holding a microphone. Behind him is a large screen reading “DTW Ignite” with colorful graphics. Next to him is an AWS panel labeled “Built for telecom innovation.”.

T-Mobile credited Ewaldsson (pictured, left) with deploying the next-generation infrastructure, so is likely keen to assure markets of Saw’s credentials in the field.

It highlighted Saw’s hand in the “introduction of new advanced network technologies and “the deployment of previously underutilised spectrum”.

T-Mobile offered no dates for Ewaldsson’s retirement, but was more forthcoming regarding Field, who is scheduled to depart her role on 30 September and take-up an advisory position running until 31 March 2026.

Field (pictured, left) thanked mentors including former CEO John Legere, current CEO Mike Sievert and COO Srini Gopalan in a post on LinkedIn, referring to fresh challenges and the chance to “explore passions waiting in the wings”.

Board member Andre Almeida is due to take on Field’s work in the role of president of Growth and Emerging Businesses, overseeing T-Mobile’s “broadband, T-ads, financial services, enterprise and government businesses”.

He resigned his board seat effective from 31 August: T-Mobile stated the move “is not the result of any disagreement between Mr Almeida and the company”.