The baseband is a separate, dedicated computer inside your phone responsible for all radio communication (calls, texts, cellular data). It runs its own real-time operating system (RTOS), its own memory heap, and its own CPU core. The main Android or iOS operating system (the "Application Processor") communicates with the baseband via a serial bus.
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The baseband firmware—which manages the actual cellular radio connection—is separate from the main Android or iOS operating system. Developers and researchers sometimes use AT Commands The baseband is a separate, dedicated computer inside