It has so many variants: N930V, N930A, N930P, N930R4, N930W8. You guys should be more professional to write clearly which one is shown here.
Versions: EVA-L09 (Single SIM); EVA-L19, EVA-L29 (Dual SIM).... Which version was this ??
The overall design is very smart. Rough guess about the antenna design can be seen at : http://wenku.baidu.com/view/28f9ea96e43a...