Access directly to your "inbox" your customers answers concerning SMS you just sent them. You can answer or export "blacklist" directly contacts from your inbox SMS.
You can send SMS to confirm your appointment with customers.
Ask the opinion of your customers about your products or your new restaurant menu for example.
Ask your customers an answer containing a keyword or a code to activate their account.
Special coupon code
Let your customers enjoy special offers for those who respond to your SMS.