Silabs Aero II transceiver datasheet?

Hello OBB gang, The Potential Calypso Targets page in your wiki lists a whole bunch of phones with Silabs Aero II (Si4210) RF transceivers: http://projects.osmocom.org/projects/baseband/wiki/PotentialCalypsoTargets I wonder, has anyone ever succeeded in finding a datasheet for this transceiver? I found the datasheet for the older Aero+ transceiver (a 3-chip solution), but not for the single-chip Aero II aka Si4210. Here are the Silabs Aero materials I have found so far: ftp://ftp.freecalypso.org/pub/GSM/Silabs/ I got the marketing briefs for Aero+ and for Aero II, and the full technical datasheet for the former of the two. If anyone has a datasheet for Si4210 and would be willing to share it, I will gladly add it to the above collection. In the interest of full disclosure, if I get a hold of this datasheet, adding it to the above FTP archive may be all that I will ever do with it: even if I had the datasheet, I do not currently have any realistic plans of adding Silabs Aero RF support to FreeCalypso, let alone to OBB. I do have a couple of Motorola W220 phones on their way to me from ebay, and hopefully at least one of them will actually make it to me, unlike the first one that appears to have fallen into a black hole somewhere, but even with ideal documentation (full schematics and chip datasheets), adding support for a very different RF subsystem (in particular, Silabs' way of doing AGC is entirely different from TI's way) would require more systems engineering work than I can do at the moment. It also doesn't help that the only tpudrv12.c reference TPU driver we have is a reconstructed source made from the disassembly of tpudrv12.obj, not TI's original source - thus all quarter-bit timing numbers (there are lots of them, and they are very critical) are just "magic" numbers, and their original derivation has been lost - does not bode well for the task of figuring out what the corresponding timings should be for a different RF transceiver. All that being said, however, this Si4210 transceiver does look like an attractive alternative to TI's Rita: the Si4210 is 5x5 mm compared to TI's 7x7 mm (every square mm counts in a tightly squeezed modem module), and it has 4 separate LNA inputs for the 4 GSM bands, to be contrasted with Rita and Aero+ arrangement of 3 LNA inputs, one of which is shared between EGSM and GSM850. The Si4210 way with 4 separate LNA inputs allows a fully quadband MS to be implemented in a much more straightforward way. Thus tracking down a datasheet for this Silabs Aero II transceiver and adding it to the knowledge base should be a good step for the GSM enthusiast community as a whole. I already tried asking Silabs for the datasheet, and got the answer that the product line in question was sold to NXP back in 2007. Reading up on Wikipedia, it appears that this stuff did not stay long with NXP either, transferred first to ST-NXP Wireless and then to ST-Ericsson, and when the latter closed, it is totally unclear where the Silabs Aero stuff went, other than the great bit bucket in the sky. :-( M~