Galaxy S9 Plus cellular signal disappears (no signal), won’t detect wifi or bluetooth

This post will show you the things that you can do if you find your Galaxy S9 losing network signal, or if wifi and Bluetooth functionalities don’t work as expected. Under normal circumstances, the usual dose of troubleshooting steps like clearing network settings and factory reset should work. If nothing change after doing them, find out what to do next below.

Problem: Galaxy S9 Plus cellular signal disappears, won’t detect wifi or bluetooth

I HAVE AN S9+ WHICH WAS PREVIOUSLY WORKING WELL BUT DEVELOPED A PROBLEM WITH ITS SIGNALS. THE CELLULAR SIGNAL DISAPPEARED EVEN MANUALLY SEARCHING FOR NETWORK DOESN’T YIELD ANY RESULTS. SECONDLY THE BLUETOOTH AND WIFI SIGNAL RECEPTION IS TOO WEAK IN SUCH A WAY THAT IF THE BLUETOOTH OR WIRELESS TRANSMITTER ISN’T NEARBY THE S9+ CANT DETECT ANY SIGNAL. I DID NETWORK SETTINGS RESET BUT IT DIDN’T SOLVE THE PROBLEM AND LATER I DID FULL FACTORY RESET WHICH STILL ENDED UP WITH THE PROBLEM PERSISTING. FINALLY I DID FULL FLASH ON THE DEVICE WHICH DIDNT HELP EITHER. RIGHT NOW I CAN ONLY THINK THE PROBLEM IS HARDWARE RELATED.

Solution: We’ve seen a lot of issues similar to yours after users try to tamper with the official software. If your Galaxy S9 Plus started to show a problem after flashing or changing the firmware, you may be able to fix it by simply reversing what you did. Since you mentioned flashing the device as a troubleshooting step, we assume you took note of the device’s modem firmware as well. Reinstall the particular modem firmware before the problem and you should be good to go.

Keep in mind that the modem firmware is separate from the operating system or Android version. Sometimes, carriers may include an update for the modem firmware to improve modem performance and fix known bugs. If you did not tamper with the official software at all before the problem manifest itself, installing a carrier update, if available, may help.

If your Galaxy S9 has been physically damaged in any way, there may be a hardware malfunction that causes some functions to work erratically. Even a tiny break in the circuit can cause erratic signals to certain components, which may, in turn, lead to problems. Since you’ve already tried to do the software troubleshooting for this case, the best thing that you can do right now is to let a professional check the hardware. A thorough hardware check may be needed to identify the cause of the problem so make sure that a Samsung technician do the said task for you.