have SHI JI XIAN FENG B889 Dual SIM card Phone
and I don't know the phone password to clear phone data. and I tried all known passwords (0000,1234,12345,9999,1111,2222, etc.) but it won't work. Does anyone know the password for these mobile phone, 'cause I want to erase phone book from the mobile.

Thanks in advance

Do u mean a code to reset ur phone? Not sure about it but I would suggest u to take it to the nearest shop in order to reset ur phone more safely and carefully.

Take it to a mobile repair shop...

Or option 2 u can use a special box to flash ur phone in order to reset ur unknown phone's code.