How does SMS work with Mobile Data Now?

Some people find it difficult to comprehend how SMS works with Mobile Data Now through all carriers.

A good analogy is like two people sending SMS messages to each other. One person asks the question (the user with the mobile phone) and the other person (The SMS modem) responds with the answer.

There is no need for any special permissions or agreement to use the networks, as it's very similar to two people sending a SMS message to each other.