A reservation changes while a short-term rental team is coordinating arrivals, cleaning and guest communication. Guesty’s New or Updated Reservation trigger gives you a practical point to send a Mobile Message SMS, so the guest or responsible team member can receive the relevant instruction without waiting for a manual check. Through Zapier, Guesty can start the chosen Mobile Message action.

Use a new reservation to send a welcome message, arrival information or a request to confirm a detail. An updated reservation can send a revised instruction when dates or other mapped information changes. Mobile Message can also create a contact or add one to a list if the reservation represents a new guest relationship. Guesty remains the operational system, and Mobile Message performs the communication step you configure.

Choose the fields and wording carefully in Zapier, especially where the same trigger covers both new and updated reservations. This creates a focused notification workflow rather than implying a two-way reservation sync.