E72 and supported WCDMA frequencies (specification...

Question

Can anyone tell me more details about the WCDMA frequencies used in the E-72?
The product specifications page first tells us about the different frequencies used in different variants:
  E72-1 Quad-band EGSM 850/900/1800/1900, WCDMA 900/2100 HSDPA
E72-2 Quad-band EGSM 850/900/1800/1900, WCDMA 850/1900 HSDPA
E72-3 Quad-band EGSM 850/900/1800/1900, WCDMA 850/2100 HSDPA
But then a few rows down instead of the 3 distinct group of WCDMA frequencies, we only get two, non of which directly overlap with the ones above:
WCDMA 850/1900/2100, WCDMA 900/1900/2100
So basically, I would like to know which one is correct?
On the sales package, outside sticker, I can also read: 900/1900/2100
I have the E72-1 (bought in Europe), but would like to know what limitations I would face if I wanted to use this in North America, for example. 

Answer 1

E72-1 is more or less the global standard version.
E72-2 is North American version
E72-3 is special version for China without WiFi.
If you have a E72-1 you can use the phone everywhere but in the US you will not be able to connect to a 3G network due to difference in operating frequencies.
Globally you can us the phone via the 2G or GSM network without any problem.
Furthermore the European version also works in Japan. The American version not.