The Nokia 6822 was based on the same design as the
Nokia 6820. The only difference was that it had a higher resolution camera and a 65k colour display instead of 4k display.
The 6822a (which is the model in the Mobile Phone Museum collection) was a tri-band device supporting 900/1800/1900 MHz frequencies. The 6822b was a US variant supporting 850/1800/1900 MHz.