Big Change to XM International Travel Roaming

Here is a link to the latest and greatest Roaming Rates: 

https://www.xfinity.com/support/articles/traveling-internationally

Free Calling and Texting (SMS) in 215+ Countries. Either GTP or Pay-As-Go for Data. 

Be aware that you will be charged at international calling rates if you use WiFi Calling. 
Be aware that non-carrier calling and messaging such as iMessage, WhatsApp, FaceTime, Signal, RCS, and so on, while not on WiFi, count as data.