Hello @CharlesD15 ,
I would recommend going through these articles to get a better understanding of how the dedicated phone number works:
Registering your account for SMS
SMS marketing overview
Replies from contacts will be handled on an automated basis, so it wouldn't be a matter of you directly receiving the responses and managing them.
For more info regarding SMS functionality:
Getting started with SMS (PDF download)
SMS marketing best practices
SMS marketing while respecting quiet hours
Enabling SMS for landing page sign up forms
Importing SMS contacts list
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