difference between - x2 - a , i ,etc, how can tell ???

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I bought my X2 , 2 weeks ago ... and , how can I tell if it is i , or a ? on sony style they sell x2a , is it better than i ... I don't get it
thnx for u'r help

'i' is the international version while the 'a' is the americas version

they have different bands for 3g.

you can tell the difference by looking at the box, it might be labeled x2a or x2i.

if your on ATT you can buy either one since ATT uses 850 and 1900 for 3g but thy are slowly moving all 3g to 850 so mind as well get the american version.

or the the 3g bands:
HSDPA 900 / 1900 / 2100 'i'
HSDPA 850 / 1900 / 2100 'a'

k , thnx man ....
now I'm in-lighted... i'll colose thhis post

Last letter indicated the country for sales:
a - USA
i - international(Europe, Asia, Australia)
c - China
This is mark for all Sony Ericsson