Unfortunately, there is not really a great way to do this for SMS messaging. We do have several Regional phone numbers that your audience may use which will work for a collection of countries. However, these numbers are based in the USA, UK, and Australia so anyone who is using a phone that is not based in those locations may get charged an international text messaging fee depending on the cell phone’s service plan (this is not a fee controlled by Poll Everywhere). These regional numbers are available and you can read more about them here if you are interested: https://www.polleverywhere.com/guides/presenter/getting-started#international-polling

Otherwise, we really highly recommend multi-national audiences use our web response method. This is free for all participants to use and will work anywhere in the world provided they have an internet enabled device or data plan.