Can't use iphone in vietnam

Hello
i'm studying in Australia,last week i bought a Iphone 3G from telstra,and they said that they completely unlock Iphone.after that,i sent iphone to my friend in vietnam,but he could not activate or use the sim in vietnam. please give me some advices,thank you

I'm studying in Australia,last week i bought a iPhone 3G from Telstra, and they said that they completely unlock iPhone. After that, I sent iphone to my friend in Vietnam, but he could not activate or use the SIM in Vietnam. Please give me some advices.
The SIM might be too old. Some old SIMs don't support 3G.
Did he connect the iPhone to a computer running iTunes to activate it?

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