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This is the processor that manages all the functions which need an antenna. The GSM phone, as well as the WiFi and bluetooth are all under the control of the baseband processor. The baseband processor has its own RAM and FLASH resources, separate from the ARM core resources. The baseband processor is a resource to the OS.

The S-Gold 2 in the iPhone or X-Gold 608 in the iPhone 3G chip used to handle all cellular function.