Massachusetts, Hawaii, Minnesota and Nevada are joining the complaint against the merger of T-Mobile and Sprint.
The merger between T-Mobile and Sprint seems to be one step closer to being finalised.
T-Mobile and Sprint are scrambling to meet conditions sought by top Justice officials weighing whether to approve their merger.
The FCC and DOJ have never reached different conclusions on a merger, Paul Gallant, a Washington-based analyst said before the news emerged.
The merger still needs the approval of the Federal Communications Commission.
No.3 US mobile carrier T-Mobile said the multiyear supply deal with Nokia will deliver the first nationwide 5G services.