The "SUCCESS for BEAD Act" amends the Infrastructure Investment and Jobs Act (IIJA) to expand the permissible uses of funds allocated under the Broadband Equity, Access, and Deployment (BEAD) Program. Specifically, it authorizes eligible entities to establish competitive subgrant programs using any BEAD funds remaining after their initial broadband deployment proposals are approved. The primary goal is to enhance and sustain the success of these broadband projects by addressing critical areas beyond initial deployment. These remaining funds can be directed towards a variety of eligible projects, including the construction of lit or dark fiber for wholesale, carrier-neutral internet exchange points , and mobile wireless communications infrastructure . Significant emphasis is placed on supporting Next Generation 9-1-1 planning, implementation, and maintenance in emergency communications centers, as well as developing workforce development programs in telecommunications, cybersecurity, and artificial intelligence. The bill also allows for investments in facilities for these workforce programs and infrastructure that supports artificial intelligence. Eligible entities awarding these subgrants must prioritize proposals that develop infrastructure in unserved or underserved regions , are strategically critical for public safety, national security, or economic development , and produce a qualified workforce. Projects enhancing connectivity to military installations or national laboratories, advancing cybersecurity, or improving network capacity and resiliency are also prioritized. A 25 percent matching contribution is generally required from subgrantees, though this can be waived, and a mandatory public challenge process is established for wholesale fiber construction projects to prevent overbuilding. The bill explicitly prohibits the use of subgrant funds for data centers primarily focused on processing and storing digital information. It also codifies the existing Build America, Buy America (BABA) waiver for the BEAD program, ensuring it cannot be revised or rescinded. The Assistant Secretary of Commerce for Communications and Information is mandated to issue guidance within 30 days, coordinating with the Secretary of Labor for workforce development aspects, to implement these new provisions.