T-Mobile is the latest in a string of high profile organisations targeted by the Lapsus$ gang. It is reported this time that they stole valuable source code.
T-Mobile hit by data breaches from Lapsus$ extortion group | TechRepublic
The operation appears to have originated with a social engineering attack directed at an employee, using credentials purchased from the dark web and by gaining access to the victim’s phone to intercept password resets the gang gained access to T-Mobile’s systems.