To investigate this, try the following steps: Enter *#*#4636#*#* into your phone's dialer. This will bring up a testing menu. Choose 'Phone/Device Information'. Perform a 'Run ping test'. From the drop-down menu, select 'GSM Auto (PRL)'. Click on 'Turn off the radio'. Finally...
the code on libsamsung-ipc/devices/ that is device-specific). So once you have transport set up, you need to know about the protocol the modem speaks. This depends on the firmware the modem is running. I know that the modem used in Nexus S is also used in some iPhone ...
Many times signal issues occur due to downgraded software. When your Android phone has an update available it will send a push notification to you. In case you don’t receive any such update then you’ll need to check that manually. To check it, go to Settings > About device > Software...