Encontre como diferenciarlas
The counterfit sim tray has a larger font, and the GEVEY symbol is not as detailed. The sim tray is cheaply made, slightly smaller and has a more polish look. The genuine GEVEY sim tray is an exact color of the iPhone 4 body.
Notice that the counterfeit circuit design is different, where as the genuine is much smoother.
The majority of the problems with the counterfeit is that they are poorly made. They used an older model IC chip which is larger in size. To make it fit into the iPhone 4, the chip is sanded down making the internal guts exposed to air. With the sand down IC chip you will have overheating issues.