I want to use Bluetooth of Raspberry Pi3 and also I want to Connect GSM module sim800l to Raspberry Pi3 ,in this instruction Bluetooth will be disable , what is the the best way to use both of them?

From this link I add enable_uart=1 in /boot/config.txt and I did this:

sudo apt-get install ppp
sudo wget "https://www.modmypi.com/download/sakis3g.tar.gz" -O sakis3g.tar.gz
sudo tar -xzvf sakis3g.tar.gz
sudo chmod +x sakis3g
sudo nano /etc/sakis3g.conf

in sakis3g.conf I added this :

CUSTOM_APN=”sim apn”

I run sudo ./sakis3g ----interactive connect the ouput is

Modem unable to register a network.

connection failed

The sim doesn't have password So why the module cannot connect to internet?

1 Answer 1


The tutorial you linked uses rpi-update

"In normal circumstances there is NEVER a need to run rpi-update as it always gets you to the leading edge firmware and kernel and because that may be a testing version it could leave your RPi unbootable". https://www.raspberrypi.org/forums/viewtopic.php?p=916911#p916911 Even the rpi-update documentation now warns "Even on Raspbian you should only use this with a good reason. This gets you the latest bleeding edge kernel/firmware."

sudo apt-get update; sudo apt-get install --reinstall raspberrypi-bootloader raspberrypi-kernel will put it back to the latest supported kernel/bootcode.

There is NO reason to disable Bluetooth.

To use serial use dev/serial0 see How do I make serial work on the Raspberry Pi3 , Pi3B+, PiZeroW

  • I did what you said, enable serial port and disable serial console, but after restart pi3 both of them is enable why? and I edit CUSTOM_TTY="/dev/ttyS0" to CUSTOM_TTY="/dev/serial0" in sakis3.conf. when I run sudo ./sakis3g ----interactive connect sometimes output is Modem unable to register a network. and sometimes in step connecting ,show connected fail why it not connect to network?
    – isan
    Nov 3, 2018 at 15:27
  • This was due to the power supply, if the module is fed properly, it can be connected to the Internet, it should feed 4.2 volts with 2A
    – isan
    Nov 10, 2018 at 15:47

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