Nokia 6255i / 6256i

i was in the metropcs store paying a bill, when a sale person approach me trying to sell me a phone. and i politely told them no, that if needed a cell phone i would go on ebay. and the saleman replied, that even if i was to buy a metro pcs phone on ebay to watch out because some metropcs phone are area specific. that it might work in one metro pcs market but not another metropcs market. is this true???????