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I am interested in buying Sony Ericcson Xperia Active (unlocked) but there are several choices and I can't figure out which phone is which. Can someone explain to me the difference? Thanks!

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a is for 'americas' i is 'international' e.g. the rest of the world. You get slightly different network support.

ST17i UMTS HSPA 900 (Band VIII), 2100 (Band I) GSM GPRS/EDGE 850, 900, 1800, 1900

ST17a UMTS HSPA 800 (Band V), 1900 (Band II), 2100 (Band I) GSM GPRS/EDGE 850, 900, 1800, 1900

This is from the whitepaper.

I belive everything else about the phone is the same.

BKW and BKO I think will be the colour scheme of an orange or white hilight.

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AFAIK not much other than the frequency bands they operate on:

ST17i: (i = International version) Dual-band

UMTS HSPA 900 (Band VIII), 2100 (Band I)

GSM GPRS/EDGE 850, 900, 1800, 1900

ST17a: (a = American version) Tri-band

UMTS HSPA 800 (Band V), 1900 (Band II), 2100 (Band I)

GSM GPRS/EDGE 850, 900, 1800, 1900

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