TAC validation 2025-09-17T10:33:08Z

That Tuesday started with the acrid smell of burnt circuit boards – three prototype devices fried during overnight stress tests. As lead engineer for our mobile security suite, I'd scheduled critical carrier compatibility checks that morning. My team huddled around the workbench, faces illuminated by the eerie glow of bricked devices. "Network registration failed," blinked on every screen. My throat tightened. Without valid IMEIs, our $200k prototype batch might as well be paperweights. Certific