Samsung is filing two preliminary injunctions against Apple, and described the move as taking the two companies into "an all-out war".
It claims that the new handset infringes on two patents to do with mobile technology, although Samsung would not elaborate further as to what these were.
War – what is it good for
"Apple has continued to flagrantly violate our intellectual property rights and free-ride on our technology, and we will steadfastly protect our intellectual property," said a Samsung spokesperson.
"We are virtually going into an all-out war."
This fighting talk suggests we'll see more aggressive moves from both Samsung and Apple as the two thrash out their patent concerns in court.
Want to know what Samsung wants you to miss out on? Here's our iPhone 4S hands on video, fresh from the Apple event last night: