Although Apple's iPad stole the show in the company's latest earnings report, its iPhone is the breadwinner.

Between April 2010 and March 2012, Apple was able to secure gross margins of 49 percent to 58 percent on U.S. iPhone sales, according to Reuters, which obtained the data from court documents unsealed yesterday and filed in the U.S. District Court for the Northern District of California. Apple's iPad, on the other hand, generated gross margins of 23 percent to 32 percent between October 2010 and March 2012.