My iPhone4s screen still black

There is no such thing as a Iphone 4GS
Did you buy it from a reputable Apple source? or is it a fake and you have been conned? Give us more information about the phone.
Lenovo Thinkpad iOS 4 Windows XP Pro

Thank you for your answer.
I may be have been conned by a false one, but it is written at the back
¨IPhone¨ Designed By Apple in California Assembled in U.S.A.
I opened it at its back, to put a sim card, but could to put it on.
At the begining, I charged it all the night, with the screen lights every 10 seconds. But I couldnt put it on.
The day after, I tryed with putting off 2 sticks at its back (that seems to protect from electric dischargement for the trip), but now its still off.
What shall I do?
IPhone 4GS iOS 4

LeGuy wrote:
Thank you for your answer.
I may be have been conned by a false one, but it is written at the back
¨IPhone¨ Designed By Apple in California Assembled in U.S.A.
Hi LeGuy: That is an issue. All iPhones are assembled in China.
Stedman
Message was edited by: stedman1
MBP 1.83, 2gB RAM, iMac (Al) 2.4, 4gB RAM Mac OS X (10.6.4) iPhone4, iPod mini, iPod shuffle, iPod Touch, Apple TV

You dont put the sim card in the back of an Iphone - it goes in a little drawer in the side. Also it takes a smaller microsim not a standard sim card.
Does your phone take a normal size sim or microsim? do you really put it in at the back?
Lenovo Thinkpad iOS 4 Windows XP Pro

No such thing is iphone 4G S, it is just iPhone 4.
Also, all iphones are assembled in China, not U.S.A. You probably purchased a fake iphone 4 that looks exactly the same as the real one.
HP Pavilion DV2812tx, HP DV4-1504tx Windows 7 iPod Hi-Fi, iPhone 4 32 GB Black