A still-ongoing teardown of the iPhone 4S has shown that the internal upgrades come from more than just the A5 processor. The now officially dual-mode phone is using a Qualcomm MDM6610, a slight upgrade from the MDM6600 seen in the iPhone 4 just eight months ago. What Qualcomm has done, if anything, with the new model isn't known, but both the old and new chipsets can handle the 14.4Mbps HSPA 3G on carriers like AT&T as well as EVDO Revision A on CDMA networks like Sprint's or Verizon's.
