FTC asks court to dismiss Qualcomm's request to stop ongoing anti-competitive case15
Moreover, Apple claims Qualcomm essentially forced an exclusive supply deal onto them and completely blocked out possible competitors. It's also unhappy with certain licensing issues and stopped paying royalties, to which Qualcomm responded by seeking to ban iPhones from being imported and sold in America.
Samsung doesn't like that Qualcomm won't license its standard essential patents to fellow chipmakers, including Sammy. This has kept Samsung and others' products from fairly competing with Qualcomm's Snapdragon chipsets and LTE modems. Indeed, a contract clause with Qualcomm is the precise reason why Sam stopped selling its excellent Exynos chips to third parties.
At the same time, all three companies are entangled in business relationships as their lawyers are duking it out in courts. Legal stuff matters, of course, but as they say on the barren planet of Arrakis, the spice must flow...