Your personal phone number is most likely used as a second factor when you log into your financial accounts. The importance of your personal phone number means that you should only give it to people that you trust. For everything else, let Mobile Shield keep you safe.
When you sign up with Mobile Shield, you get a free phone number that you can use. You can then use this phone number for sending and receiving text messages, without having to carry a second phone around constantly.
All incoming messages are free. To cover the cost that phone carriers charge for this service, we sell packages of credits that can be used for sending messages. These may be purchased in the app.