Mobile phone(fake version nokia n73)

i had purchase this phone from grey market ...its works well for a month....but after a month it start trouble shooting .....it doesn,t support the sim card ..& switched off....while works well without a sim card.......well it is a chinies fake version of nokia n73(RM 133 v2 .0628.0.0.1) looks exactly like the original one...
        i had visit to a repairing shop but he told me their is no port available in this mobile to reset its software....as in original a port is available for inserting & removing of diff. softwares while in this no such attachment is given......becoz flashing cables are not available in market for this mobile.& the person from whom i had purchased it had never seen to me.....if chance has taken to give to the  mobile shop then it may totally switched off........what should i do .....plz help me..