Can an unlocked 3gs iPhone bought in the US work with a Portuguese SIM card?
yes. once an iphone is universally unlocked it will work.
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?
they have already been released
Would iPhone 4S bought from US work with Philippines sim card?
Mine's doing the same thing!