You rent a virtual mobile, landline or toll-free phone number, or a physical SIM, via the website or Android app. The phone number is then yours as long as you

You rent a virtual mobile, landline or toll-free phone number, or a physical SIM, via the website or Android app. The phone number is then yours as long as you keep paying the rental fee. (After you delete it or stop paying, we don't give it to anyone else - we return the number to the upstream phone networks who will, as with all phone numbers, 'quarantine' it for many months and then eventually re-use it.) You can then send and receive SMS, make and receive calls and send faxes using the numbers via the website or the Android app. Pro accounts can also make and receive calls via SIP.