How to install Signal on Desktop without smartphone but with old phone or landline

  • Install Signal for Desktop.
  • When you open Signal, you’ll be asked to Link your phone to Signal Desktop and there will be QR code. Take a screenshot of this QR code and save is as a file. Keep your Signal app open all the time.
  • Decode QR code using some tool i.e. You should obtain tsdevice URI which looks like this:
  • If you have Docker installed on your machine you can execute below commands in the terminal on your local machine. Otherwise you can use some online tools like (without login) or (Docker account required) or something else.
  • Start Ubuntu instance.
docker run --rm -it ubuntu:latest /bin/bash
Code language: Bash (bash)
export DEBIAN_FRONTEND=noninteractive && apt update && apt install -y openjdk-16-jdk-headless && apt install -y wget && wget && tar -zxvf signal-cli-0.7.2.tar.gz && cd signal-cli-0.7.2/bin
Code language: Bash (bash)
  • Don’t forget to replace +447777777777 with your number.
export NUMBER=+447777777777 ./signal-cli -u $NUMBER register
Code language: Bash (bash)
  • If it’s mobile number you should receive sms saying SIGNAL: Your code is 111-111. Otherwise (if it’s landline) you’ll get a call. Replace 111-111 with your code below.
./signal-cli -u $NUMBER verify 111-111
Code language: Bash (bash)
  • Finally you’re ready to link your Desktop app. Don’t forget to replace tsdevice URI with the one you obtained from your QR code.
./signal-cli -u $NUMBER addDevice --uri "tsdevice:/?uuid=1111111111111&pub_key=111111111111111111111"
Code language: Bash (bash)
  • Happy days! Your app should be linked!
  • Environmental cleanup
rm ~/.local/share/signal-cli/data/$NUMBER exit
Code language: Bash (bash)

All done!

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