The regulation, which would come into force on Jan. 1, 2017, requires companies that sell smartphones and tablets in the fast-growing economy of 250 million people to produce 40 percent of their content locally.
               
The office of the U.S. Trade Representative (USTR), America's chief trade negotiator, said it was raising the issue with the Indonesian authorities and in multinational forums.
               
Critics of the "made in Indonesia" rule, including an influential U.S. business group, say it could increase costs and restrict access to technology.
               
"The United States shares these concerns, and strongly supports ensuring that information and communications technology, which can be instrumental to economic development, be openly available in Indonesia," said a USTR spokesman in Washington.
               
Less than a third of Indonesians own a smartphone, a much lower rate than China's almost 80 percent, according to figures from research firm Canalys, making the country a highly attractive market for companies such as Apple Inc and South Korean rival Samsung Electronics Co Ltd.
               
Samsung has already begun producing phones in Indonesia after opening a factory near Jakarta last year.
               
Apple's supplier Foxconn, whose flagship listed unit is Hon Hai Precision Co Ltd, has been dragging its feet as it negotiates with the Indonesian government over a proposed investment that would include manufacturing smartphones.
               
Apple and Samsung did not immediately respond to requests to comment on the local-content rule.
               
Indonesia's Communications Minister Rudiantara, who is working on the regulation that is due to be finalised by March, could not reached for comment.
               
Rudiantara told Reuters in January that the regulation would help Indonesia get a share of the roughly $4 billion in annual d0omestic smartphone sales and support President Joko Widodo's pledge to switch the country from an economy that mainly consumes products, to one that produces them.