In a country where nearly every facet of society is controlled, North Korean authorities are encountering a new foe: the cellphone.

Mobile phones, which are ubiquitous in China and South Korea, are now infiltrating North Korea and are allowing information into - and out of - the "hermit kingdom."

Douglas Shin, a Korean-American minister who has been campaigning for human rights in North Korea, sees the emerging cellphone "revolution" as paralleling, if not abetting, budding dissent against the government.

"At first cellphones worked on a narrow band of land along the Chinese border," says Mr. Shin. "Now they can penetrate a great distance."

Often, he says, cellphone users must climb a hill or mountain to use them, but still he says it's possible to convey messages that previously would never have penetrated the barriers of a state that bars normal international mail and ordinary telephone calls for all but a privileged few.

Many observers say the fact that anyone can hold such long-distance conversations in North Korea could spell trouble for the country's leader, Kim Jong Il.

Shin predicts the US government may even use the spread of cellphones to help bring about regime transformation, if not change in North Korea. He predicts that the US in the next two or three years will begin sending cellphones into North Korea, just as it now plans to penetrate the North by smuggling in small radios capable of receiving Voice of America and Radio Free Asia, both official US stations.

It was shortly after the rail disaster last April in the town of Ryongchon, just 10 miles south of the Yalu River border with China, that the government imposed a ban on all cellphones. North Korean officials have suggested that the ban was intended to stop saboteurs from plotting against the North Korean regime. Kim - whose train had sped through Ryongchon shortly before two trains collided and blew up, killing several hundred people - is widely believed to have been the target.

"If possible, Kim wants mobile phones to disappear in North Korea," says Nishioka Tsutomu, a professor of modern Korean studies at Tokyo Christian University. "But North Korean people do not have enough food. To trade on the black market in China, it is essential to have a mobile phone."

Despite the ban, North Koreans have been using cellphones more than ever, according to visitors to the region. Whether crossing the border legally on official business or illegally to procure food and other vital supplies, they routinely rent or purchase phones on the Chinese side, then turn them off and hide them from border guards as they return.

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