Call Of Duty may hold the crown when it comes to those war-themed first-person shooters on the consoles, but on mobile devices, there are several contenders vying for that spot as the go-to warfare battle title. Modern Combat has established itself as a fine example of how one can enjoy precision combat without a physical controller, and today, Gameloft’s eagerly-awaited Modern Combat 4: Zero Hour has released over at the iTunes Store.