Try to unlock iphone

hey so i bought an iphone recently and it came with the 2.0 firm ware i followed instructions to downgrade it and i am now at 1.1.4 so far i have used: Ziphone, iLiberty+ to unlock it and both applications run fine but when i insert my tmobile sim card it does not show any signal or anything the phone works fine but it does not show the phone is on any sort of network. please help i am stumped.