"Why "No Service" after replacing LCD screen?"에 답변after opening and closing more times than i care to renember, what worked for me was so simple. i used the wfi to reset the time, took out the sim and reinserted and hay presto i got a signal. this will work for you if the phone doesnt find the sim in the general settings. other wise its probably the antenna connection or finally solder the bit*h. dont throw it out just yet.