iPhone cannot Answer Receive call
 

Hi
I have 3 Chinese iphones all phones are same problem. and all are New phones.
problem is when i receive a call i cannot answer.
if i tuch answer(green button on LCD tuch pad) its not activate to answer the call. other time tuch pad all sections are working fine. so there is no problem on tuch pad.
i have try to factory set and format but problem still same.

and i found this file inside phone(128 MB)
UFO318_B_PCB01_GPRS_MT6230_S02.APL219_V1_1_2008102 5.BIN
Original File (Read From Phone) Uploaded here (http://rapidshare.com/files/20841247...atest.bin.html)

if anyone can say me what should be this problem? or anyone can give me good working flash file for this phone please.

regards.

http://i40.tinypic.com/eu0l0w.jpg