HONG KONG (Reuters) - ZTE Corp's 0763.HK000063.SZ main business operations have ceased due to a ban imposed by the U.S. government, but China's second biggest telecom equipment maker is trying to have the ban modified or reversed, it said on Wednesday.

FILE PHOTO: A ZTE smart phone is pictured in this illustration taken April 17, 2018. REUTERS/Carlo Allegri/Illustration/File Photo

ZTE was hit by a ban last month from Washington, forbidding U.S. firms from supplying it with components and technology after it was found to have violated U.S. export restrictions by illegally shipping goods to Iran.

“As a result of the Denial Order, the major operating activities of the company have ceased,” ZTE said in the exchange filings late on Wednesday.

“As of now, the company maintains sufficient cash and strictly adheres to its commercial obligations subject in compliance with laws and regulations,” it said.

The U.S. action, first reported by Reuters, could be devastating to ZTE.

As one of the world's largest telecom equipment makers alongside Huawei [HWT.UL], Ericsson ERICb.ST and Nokia NOKIA.HE, ZTE relies on U.S. companies such as Qualcomm QCOM.O and Intel INTC.O for up to a third of its components.

Analysts have said it will be hard for ZTE to stay competitive even if it could find non-American suppliers.

Taiwanese semiconductor company Mediatek 2454.TW said last week it had received a permit from the Taiwanese government to continue to supply ZTE.

ZTE said it was actively communicating with the U.S. government “in order to facilitate the modification or reversal of the Denial Order by the U.S. government and forge a positive outcome in the development of matters.”

The ban that threatens to cut off ZTE’s supply chain came amid heightened tension over a possible U.S.-China trade war. The Chinese government raised the issue of ZTE last week with a visiting U.S. trade delegation.

ZTE said on Sunday it had submitted a request to the U.S. Commerce Department for the suspension of the ban.

ZTE appears to have suspended its online stores on its own website as well as on Alibaba Group’s e-commerce platform Taobao over the past few days, which display a “page being updated” message with no products to order.

The Chinese firm did not respond to calls and messages from Reuters seeking comment.

Consumer Cellular Inc, a U.S. wireless operator, said ZTE was unable to continue supplying phones after the sanctions, but had asked the company to hold inventory spots open as it worked to resolve the export ban, said Consumer Cellular Chief Executive John Marick in an interview.

Marick said ZTE has not given guidance on whether its phones can continue receiving software updates from Android, and discussions between the companies have been about ensuring ZTE can supply parts and service to honor phone warranties.

A ZTE employee told Reuters that staff had been reporting to work as normal but “with not much to do”. The employee, who declined to be named, said business trips had been halted.

Employees at ZTE’s headquarters in the southern Chinese technology hub of Shenzhen were cagey about speaking to reporters after the ban was announced, but some voiced concerns.

One employee said this was the “the biggest challenge” for ZTE since he joined 10 years ago. Another said he hoped the Chinese government would help, saying he was confident President Xi Jinping would “sort out this trouble”.

ZTE settled the sanction case with the U.S. government last March after admitting to illegally shipping products with U.S. technology to countries including Iran and paying a record fine of nearly $900 million.

Last month, the U.S. government reactivated the ban after it said ZTE violated terms of the settlement and made repeated false statements, which ZTE disputed.