User blog comment:Dajoman/How the Omnitrix was Removed/@comment-3549757-20120712081023

Clearly the Omnitrix was not removed in Secrets of the Omnitrix, as Ben is now 11 in Omniverse and still has it. As shown in Alien Force and Ultimate Alien, there are multiple ways to remove the Omni/Ultimatrix, Ben probably figured out how to and decided to remove it. Just wait and see if it is revealed within the series.