Can several smartphones be used to scan for the same account?

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Yes, absolutely!

This is how to do it:

If you already have a Joyn account:

  1. Download the Joyn app on the smartphones
  2. On all smartphones, log in with the same Joyn account

If don't have a Joyn account yet:

  1. Download the Joyn app on the smartphones
  2. Create an account on one of the devices
  3. On the other devices, log in with the same Joyn account