Can an unlocked 3gs iPhone bought in the US work with a Portuguese SIM card?

Answer yes. once an iphone is universally unlocked it will work.

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Will a iPhone 4 bought in the US when unlocked work in UK on a UK Orange pay as you go sim card?

Yes, actually it's the only carrier you can buy the iPhone 4 from in the US.

Can an unlocked iPhone 3G work with a boost sim card?

go to settings, general, bluetooth and turn it on. you can only use the bluetooth feature for bluetooth headphones

Does an iphone bought in Hong Kong work with a UK sim card?

Would iPhone 4S bought from US work with Philippines sim card?