The country’s top leaders are reviewing a proposal to combine China United Network Communications Group and China Telecommunications (CHA) but no decision’s been made and a merger may not happen, said the people, who asked not to be identified discussing a private matter.

At stake is the ability to shape and control 5G, the high-speed wireless technology billed as the key to revolutionizing how we use everything from home appliances to cars. Concerns that China could get the upper hand led to U.S. President Donald Trump to block Broadcom’s bid to buy chipmaker Qualcomm, in what would have been the biggest-ever acquisition in the technology industry.

The Hong Kong-listed vehicles of the two state-run companies, both of which trail China Mobile (CHL) in scale, surged on Tuesday. China Unicom (Hong Kong) Ltd. climbed 5.9%, the biggest gain since November 2016, while China Telecom rose 4$ to the highest close since Jan. 29. Their combined market value increased to more than $77 billion.

Unicom said it isn’t aware of a merger. China Telecom didn’t immediately respond to a request for comment. The State-owned Assets Supervision and Administration Commission, which oversees China’s state-owned enterprises, and the Ministry of Industry and Information Technology didn’t immediately reply to queries.

The combination of Unicom and China Telecom would create a carrier with more than 590 million mobile-phone subscribers, a number that would be second only to China Mobile among wireless operators worldwide. The proposal being reviewed argues that a merger could speed up the government’s ability to push through its 5G ambitions because a combined company could make the necessary investments more easily than separately, the people said.

Merger Speculation

A deal may not be a total surprise to analysts such as Jefferies Hong Kong’s Edison Lee, who’s been flagging the possibility of a merger between the two companies since July and as recently as last month. Chinese media has also speculated on a possible merger, though executives at Unicom and China Telecom have played those down as recently as last month at their earnings briefings.

The Chinese government has been considering the merger of the two carriers for years but escalating tensions with the U.S. have raised the urgency of the matter, the people said. For example, the U.S.’s recent temporary export ban on ZTE (ZTCOY), which nearly crippled the company because of its reliance on American technology, helped give China reason to make 5G development a higher priority, the proposal argues, according to the people.

A merger would also signal that the Chinese government would be willing to sacrifice the benefits of local competition over the speed of 5G adoption by reducing its number of phone operators to two. Most markets worldwide have three to four carriers.

China’s had its share of setbacks during its campaign. Huawei Technologies, the world’s largest maker of equipment for phone networks, and ZTE were banned last month from selling their gear to a U.S. ally, Australia, which cited security concern. Huawei and ZTE, which aren’t able to sell their network gear to U.S. carriers as well, have disputed they represent any such risk.

In its opposition of the Broadcom-Qualcomm deal, the U.S. argued that the acquisition would likely cut Qualcomm’s spending on research and development, indirectly giving Huawei a greater advantage in the race to develop 5G wireless standards and equipment.

China Influence

The deal would have left “an opening for China to expand its influence on the 5G standard-setting process,” the Committee on Foreign Investment in the United States, or CFIUS, wrote in a letter dated March 5. Because of the “well-known U.S. national security concerns about Huawei and other Chinese telecommunications companies, a shift to Chinese dominance would have substantial negative national security consequences,” it said.

Communications technology is part of President Xi Jinping’s “Made in China 2025” program to make the country a leader in a range of high-tech industries. China holds a narrow lead over the U.S. and South Korea in 5G readiness, thanks to proactive government policies and industry momentum, according to a report by research firm Analysys Mason.

Beyond geopolitics, a merger between Unicom and China Telecom would form a more formidable challenger to China Mobile, which boasts more than 900 million subscribers, in the world’s biggest mobile-phone market. It may also raise concerns at recently listed China Tower Corp., whose business model makes the company benefit from more carriers, not fewer. China Tower shares fell by a record 6.8%.