are those second hand smart phone, or they are new? and where it will be located?, the problem with goods from usa is that for us european there are trouble with the customs
They are new.
They are just 1:1 clones of the originals.
Yeah, the Chinese are good at this

How long will these last? My friend got one of those fake Samsung S3 (or something like that, the costly one) and the touchscreen broke in a few days and it stopped receiving calls a few days after that.
Hmm, that depends, mostly on your luck.
I got 2 Samsung Note 3 clones, one for me one for my sister.
My sister dropped hers and broke the screen, the phone still works just fine though, even though the screen is cracked.
I was careful with mine yet my screen got fucked, it wouldn't work properly.
So like I said, it's a matter of luck.
The Chinese make good clones, it's just that some of them might come out faulty.
That goes with everything though.
My Mercedes came out to be faulty from the factory and it's not Chinese.
There's a simple difference: warranty. Does these clones come with a year's warranty?