The InterDigatal 2.5G stack (???)
Data,
<< InterDigital has developed second generation GSM/GPRS/EDGE (2G) and [***] communications technology that is compliant with [***]. >>
They may have done that but (and correct me if I am wrong) the "second generation GSM/GPRS/EDGE " stack in the SlimChip was licensed (to be sublicensed) from Infineon based on exiating Comneon and/or Agere/LSI IP and development and at least initially Infineon used a separate 2nd stack housed in in a single package in the the XG608 and XG208 (fka S-Gold 3) for 3GSM handsets from Apple, Samsung, and possibly LG.
Edit: Just realized I somehow responded to an April post you made. Best I catch up. <ggg>
Cheers,
- Eric -