Hi everyone,

I'm building some FOSS tools that let people send/receive calls/SMS without a 
cell plan (mainly using VoIP carriers that also offer SMS/MMS).  Eventually I 
would like to be able to bundle these tools with a phone that runs only free 
software.

In order to still provide standard emergency calling features (112/999/911 
calling/SMS), the phone would require a free baseband (like FreeCalypso), but 
it would not need to offer any non-emergency phone features, since those would 
be handled by the aforementioned FOSS tools primarily on wifi.

My understanding from being on the list for a while is that the current 
baseband firmware works for some basic use cases on existing phones, but the 
end goal of FreeCalypso will require building a phone (or at least the main 
board of one).  Do the existing basic use cases include sending emergency texts 
or calls?  If not, would developing the remaining pieces needed to do so be 
substantially easier for an emergency-only use case than for a complete 
all-purpose use case?

I'm guessing that there are certain parts of FreeCalypso that would not be 
required for emergency-only operation (perhaps some of the SIM card 
communication, for example), but I haven't written baseband software before so 
I don't have a good sense of how large the differences would be.

So I'd be curious to know if the emergency-only use case is substantially 
easier to develop for, or if it's roughly the same complexity as developing for 
the all-purpose use case, or somewhere in between.

You may have seen a similar message to this one on a different list - I'm 
hoping to hear from multiple projects and apologize if that feels like 
duplication.  Thanks for reading!

Denver
http://soprani.ca/
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