The carrier joins a growing list of known victims, including AT&T and Verizon, of the major Chinese spying operation.

Hackers linked to a Chinese intelligence agency were able to breach T-Mobile as part of a monthslong campaign to spy on the cellphone communications of high-value intelligence targets, the Journal added,

T-Mobile's network was among the systems hacked in a damaging Chinese cyber-espionage operation that gained entry into multiple U.S. and international telecommunications companies, The Wall Street Journal reported Friday.