The 21-second video circulating on the Internet is entitled "Samsung handset, easy to break at one try!" and shows a smiling woman snapping a Samsung Ultra Edition mobile phone in half.

Ultra Edition, one of the world's slimmest handsets, has been a huge success for its sleek design and various functions.

Samsung, the world's third-largest mobile phone maker after Nokia and Motorola, believes the handset had been damaged earlier to make it appear easy to break.

"We are conducting a probe into who made and distributed (the video clip)," a Samsung spokesman told AFP.

"The phone is not easy to break because it is made of new materials such as magnesium and fiberglass-infused plastic," he added.

Ultra Edition, which was unveiled in June, was Samsung's latest success at a time when it has lost ground to rivals in overseas markets.

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