One-time SMS number is a service designed for online verification. You receive one SMS with a verification code and the number gets disconnected. The one-time SMS number does not differ from the usual virtual SMS number, except for the "life cycle" and the lack of physical carrier.
Currently, the service "Disposable SMS" is only available in the user's Personal Account on our website. The service is not available in the application at the moment.
To connect the number, go to your personal account, select "Buy number" -> "Disposable SMS". You will then be forwarded to the purchase page with further instructions.
The cost of the service is $1.