You can use PassageMobile only in Nigeria.
No, PassageMobile is available to all Network Operators. In as much the number has been registered and it is currently operating.
No, only a single number is required for the registration. Subsequent numbers can be added at any anytime.
No, users can sign up, pay and register on the web page. After you have access to your dashboard, you can download the app and then sign in. However, users can also sign up directly to mobile app.