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There are, but I think the idea here is “the more the merrier”.

I wouldn't go that far. Rather I'd say that it opens up the risks and abuses to a much wider audience. I think the fact that there is no open source baseband firmware or open hardware for the GSM/LTE stack makes it even worse. There is no escape valve for consumers to exercise control over their privacy, and the technology doesn't care about regulatory boundaries, not that _any_ countries government actually wants that.

Currently Osmocombb can be considered a fully open source and audittable GSM stack, down to the baseband and modem firmware. Too bad it does not fit the phone completely.

FreeCalypso does and is audittable, but it's licencing situation is murky at best. It's based on leaked Texas Instruments sources with a gpl licence stuck on top. But Calypso is essentially abandonware and TI got out of the GSM modem biz in early 2000's so they apparently don't care.

For LTE there's srsUE from Software Radio Systems, but it's a 100% SDR implementation that does not fot any phone and is more of a lab and research tool. But it is open and audittable.

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