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most Android phones have a separate Android system running in the modem

Very strong doubt. They're usually running a RTOS. My experience has mainly been with Mediatek's, which use Nucleus Plus.

The OP may have confused things with the ultra-cheap USB modems which are actually a headless smartphone, and those do run Android: https://liliputing.com/this-dirt-cheap-4g-lte-modem-on-a-usb...

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What about Qualcomm modems? It is the case for this one at least.

My experience has been that Qualcomm mobile phone chipsets don’t run Android on the modem side, but that standalone (ie laptop / USB / router) ones like this Quectel part sometimes do, in order to provide the userland components that run on the phone’s Android system / AP in a phone application. The actual basebands run an OS called REX usually.

Thanks, corrected it.

Think I've heard something about OKL4 but I wouldn't be sure.

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