http://blog.symbian.org/2010/04/14/build-your-own-phone
Build Your Own Phone…
We have seen that the best way to engage with independent developers has been through a truly open hardware platform like the BeagleBoard, where the data sheet is not secret and the base port is available in source code form. This had to be the starting point if we were going to do something about modems. Having a truly open modem is still a step further; the cost of development of the stack, including the conformance and safe for network testing makes it nearly impossible for the weekend enthusiast. Don’t despair though, there are solutions other than porting Symbian to the HTC ADP1 or the Nokia N900… off-the-shelf GSM/UMTS modules.