The main thing the Nokia 6681 differs from the Nokia 6680 is the absence of 3G support (only GSM, no WCDMA). The heart of the both models is Texas Instruments OMAP OMAP1710 220 MHz processor. That is not a system-on-chip solution; they suppose a separately integrated radio chipset (of the second, the third generation or CDMA 2000 1X by the manufacturing company wish). And under such conditions Nokia managed to produce three versions of the one model with different radio chipsets with no extra effort for development.



Link: Mobile Review