How much value do you put on certain features in the cellphone you buy? Most consumers probably don't assign a dollar value to specific items, but the detailed calculations handset manufacturers make were at the heart of arguments Thursday as Apple and Samsung fight over hundreds of millions of dollars in patent infringement damages in a California court.Apple is asking an eight-person jury to award it US$380 million in damages for infringement of five of its patents in 13 models of Samsung cellphones. Samsung says it should only pay $52 million, so the value of the features covered by the patents lies very much at the heart of the jury's decision.The proceedings are a partial retrial of a case last year that found Samsung guilty of patent infringement. The jury awarded Apple $1.05 billion in damages, but U.S. District Court Judge Lucy Koh ordered $450 million struck from the award after determining the jury miscalculated the amount. The jury will recalculate damages after hearing testimony.