Hello all. Ive regristered here today because im having a huge issue with my iphone 4s. Ive changed countless LCD and digizers and never had an issue, work on my own 4s, and **** hits the fan. I changed the LCD and digitizer in my launch day 4s and ever since i cant get any signal for my cellular. I tried my antenna (the part on the speaker) in a friends iphone 4 and it works fine. Wifi works fine, bluetooth seams to work, but no cellular. Once in awhile i can get 1 bar, sometimes itll go full signal, then it'll cut right out and die on me again. Anyone have any tips? did i maybe forget a screw that im not seeing? Exactly what screws (or anything else) is required to make the cellular service work? I can see my imei number, so i know the baseband itself is working even when i have no service. Thanks in advance for any advice.