After you send a group SMS message (a.k.a. text message) or send an SMS message to an indvidual guest, recipients can reply back to the phone number associated with your Insigt account. You can view and reply to recent inbound SMS messages from within Insight.

To view recent inbound text messages from all accounts that have not yet been replied to

Login to your Insight account and navigate to Home Icon → SMS → Recent SMS Messages With No Reply.