Chosen Solution
I rebuilt my entire phone and after putting it together the WiFi was not working so I replaced all the antennas. This fixed my WiFi issue but now I get terrible service. Which of the three antennas is for cellular service? Everywhere I look all three are described as the network/wifi/bluetooth antennae (so which one is it for each operation?) Also my camera was bad before rebuilding so I replaced it … the first time replacing it seemed to work fine … then I had to take it out to look at the antennas and after re-installing it it now vibrates again … i’m hoping this is because the camera got damaged at some point during the de-installation/re-installation process. Thanks for the help!
Hey! First of all, here is the cellular antenna: https://de.ifixit.com/Anleitung/Image/me… It sits directly above the WLAN/Bluetooth-Antenna. I also replaced the housing about one year ago and did not noticed any issues with the cellular connection. But I also can imagine a bad-quality housing COULD cause it. If you are sure the cables are connected correctly and have no option to test another cellular antenna I would try to use your old housing to test if it works fine there. Yes, it is a LOT of ugly work to but all back, but finally you can find out if the issue is the housing or the phone.
I would try disconnecting all of the antennas and cleaning anywhere they need to make conductive contact on both the male and female sides of each connector using a q-tip and 99% isopropyl. I have experienced finger grease interrupting both wifi and cell signal just from touching a connector while plugging it in.
