A string of code found in the latest version of the iPhone SDK, released yesterday, points to a new baseband chipset that may be included in the next-generation, 3G-capable iPhone. The code was discovered by Zibri, the developer behind the ZiPhone jailbeaking/unlocking tool, and contains a “SGOLD3” string, which presumably points to Infineon’s S-GOLD3H chip (Infineon’s S-GOLD2 chip is used in the current iPhone). The chip…