Are there any additional costs on incoming replies to my Two-Way messages? There will not be any additional cost for the sender to send messages back to this number. Updated on May 9, 2016 Was this article helpful? Yes No Related Articles What is the difference between long code and short code? Can I see the replies from the customers in the customer portal (Two-Way SMS)? What is Two-Way SMS/virtual number? How much does a Two Way SMS Solution cost? How long is the contract for a Two Way SMS number?