People use iPhone emulators to test websites and also for checking various iPhone applications as well.
iPhone emulators are designed so that applications, games that are designed for iPhones are made available for other cross-platforms as well.
Mobile phone emulators are therefore designed to bridge this gap. For example, a game application developed for Android phone should be made available for smartphones running on other OS. Emulators have long been in the market because there is a need to fill the void of running one application meant for a specific smartphone to run across various platforms.