You don't. Symbian EKA2 platforms (eg. S60 3rd edition and later) used to run baseband as userspace threads on same core as user applications. I would not be th

You don't. Symbian EKA2 platforms (eg. S60 3rd edition and later) used to run baseband as userspace threads on same core as user applications. I would not be that surprised if that was main enabler for Nokia E51/52, ie. full-featured smartphone in executive-phone form factor (small and in the first place thin candy-bar).