Why is CoverMe text SMS far more secure than regular text SMS?

Traditional text message is transferred in a simple and readable text format across cellular carrier networks. This renders a text message readable at many points through its transmission. This is even more of an issue if the message is transmitted between different carriers. A CoverMe text message is encrypted so securely that they cannot be read by anyone who is not authorized i.e. no-one but the sender and recipient. The end-to-end encryption makes it impossible to reconstruct the message without the decryption key which is only available to the recipient and is applied transparently to sender or receiver.
However, the end-to-end encryption doesn’t require CoverMe user to enter a decryption key whenever you try to read a received message. It just takes place behind the screen within a secret tunnel.