I was poking around and noticed the MAC address for WiFi and Bluetooth both start with 5C:59:48. That fits with the 4G teardown showing a single chip integrating the two services. However, a search for "rv km0727121" printed on the teardown chip revealed nothing. I tried looking up the MAC address at Coffer.com's vendor search and it returned as an invalid string. Apparently the iPhone uses a combo chip from Cambridge Silicon Radio, and their only 802.11n combo chip is called the UniFi CSR6026. However, CSR's MAC addresses start with 00:02:5B, (a much more standard string). So here's what I'm thinking: Apple could be using the UniFi CSR6026 in the iPod Touch 4G, but cleverly changed the MAC address format and also removed CSR's label from the chip. So it's either that or Broadcom's BCM4329 chip, as suggested by the iPhone Wiki. Thoughts? Anyone know more Bluetooth info I missed?