You can enable toll-free number text messaging, which means people can send text messages (SMS or MMS) from their cell phones straight to your toll-free number. The text message is then converted to an email and sent right to your inbox. You can then reply to that email, and the message will be sent back to the person who texted you. They will receive that message as an SMS text from your toll-free number.
If you prefer to manage your text messages via an online dashboard, you can also login to a toll-free texting dashboard, and manage your messages.