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Signal Desktop is a secondary device client for using Signal with an already registered account. Accounts can be registered only with a primary device client, either an Android or iOS device or using [signal-cli](https://github.com/AsamK/signal-cli) as primary device. [Signal Desktop will keep linked forever](https://whispersystems.discoursehosting.net/t/will-linked-signal-desktop-keep-working-if-primary-phone-app-isnt-in-use/20465) even when not using/uninstalling the primary device Signal (e.g smartphone) **if Signal Desktop is used at least once a month, otherwise you'll loose the coupling to your Signal account**. Also re-registering the number decouples your Signal Desktop.
Signal Desktop is a secondary device client for using Signal with an already registered account. Accounts can be registered only with a primary device client, either an Android or iOS device or using [signal-cli](https://github.com/AsamK/signal-cli) as primary device. **Signal Desktop will unlink when not using the primary device for some months since [Signalintroduced quantum resistance](https://signal.org/blog/pqxdh/). Also, if Signal Desktop isn't used at least once a month, you'll loose the coupling to your Signal account.** Also re-registering the number decouples your Signal Desktop.
### Full Signal registration and usage only on Tails&Tor
Signal can not only be registered using mobile phone numbers, but using any number (including landline, virtual numbers etc.) which is able to either receive text messages or voice calls. **If you want to do everything via Tails&Tor not requiring any other phone device, use a virtual Voice-over-IP number on the internet with an optional mailbox** (answering machine) accessible via web or mail. Set the mailbox greeting message as short as possible. During the registration procedure, Signal will call your virtual number leaving a message with the verification code.