i have been googling and searching for days. i need help. i bought a used 16gb 2g iphone that was supposedly unlocked. it had cydia on it, but no matter what i did whenever i put my tmo sim in it it went to emergency call screen/connect itunes. after using winscp to change the lockdown folder, it says "different sim detected" and wont allow any access to the menu. however it shows signal and displays tmobile and allows me to make and recieve calls but i cant access the rest of the phone. what do i do?