T-Mobile US Inc
US government officials have been pressuring T-Mobile's German majority owner, Deutsche Telekom AG
That pressure is part of the national security review of T-Mobile's $26 billion deal to buy US rival Sprint, the sources said.
The Committee on Foreign Investment in the United States (CFIUS) has been conducting a national security review of the Sprint deal, which was announced in April. Negotiations between the two companies and the US government have not been finalised and any deal could still fall through, the sources cautioned.
T-Mobile and Sprint shares were both down 1.2 percent on Friday.
Like all major US wireless carriers, T-Mobile and Sprint do not use Huawei equipment, but their parent companies use Huawei gear in overseas markets.
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Sprint's parent, SoftBank Group Corp <9984.T>, plans to replace 4G network equipment from Huawei with hardware from Nokia
Deutsche Telekom, Europe's largest telecoms company, on Friday said it was reviewing its vendor plans in Germany and other European markets where it operates, given the debate on the security of Chinese network gear.
Sprint, T-Mobile, Deutsche Telekom, SoftBank and CFIUS declined to comment.
Huawei has said the security concerns are unfounded. Tensions have been heightened recently by the Dec. 1 arrest of Huawei's chief financial officer, Meng Wanzhou, in Canada for possible extradition to the United States.
US prosecutors accuse Meng of misleading multinational banks about Iran-linked transactions, putting the banks at risk of violating US sanctions. Meng, who is the daughter of Huawei's founder, has said she is innocent.
The Justice Department and Federal Communications Commission must also approve the proposed deal between the third and fourth largest US wireless carriers. T-Mobile previously said it expected the deal to close in the first half of 2019.
The agreement was reached after four years of on-and-off talks that set the stage for the creation of a company that would compete more favourably with the top two wireless players, Verizon Communications Inc