CertMaster Labs are not available for use on mobile devices. For more information about the technical requirements for CertMaster Labs, see this article. Related articles How Do I Access CertMaster Labs Products Through My CompTIA SSO Account? What Are the Technical Requirements for Using CompTIA CertMaster Labs? How Do I Access CertMaster Practice on a Mobile Device? Is the CertMaster Lab Environment a Simulation or a Virtual Machine (VM)? How Do I Create a CompTIA SSO Account?