Many carriers (Verizon, T-Mobile US, Jio, etc.) block USSD codes that access engineering modes. They do this to prevent accidental network changes. If *#0011# does nothing, your carrier has likely disabled it.
Samsung locks many engineering codes on mid-range Exynos 1480 devices (A55) for security and carrier compliance.
Initiates a factory data reset (removes all accounts, apps, and settings). Use case: Only if selling the phone or fixing persistent software issues.
Put the phone in Airplane Mode → Turn on Wi-Fi → Try the code again. Sometimes, codes work offline since they don’t require cellular service.