Are users able to reply back to a text message?

US :

There are a couple of options if you would like for your users to be able to respond back to a message they have received (2-Way Messaging).

1.)  By utilizing a keyword (a preset word used to tie responses to your account), users can reply back and responses can be forwarded to a specified destination.

2.)  By leasing a dedicated shortcode, replies can be accepted and delivered to you in the format that you wish them to arrive. (i.e., an email inbox, a listener page designed to accept responses, a software suite, etc.)

Rest of the World :

 2-Way Messaging is available to customers.  The service can be 'rented' for 1, 3 or 6 months as well as 1, 2 and 3 year increments.  This service allows for replies to be received to a specified number or email inbox.