Thanks a lot for contacting us, we hope you're having a great day. The invisaWear device does work internationally. If you are outside of the United States, the invisaWear would be able to send text message alerts to your emergency contacts informing them that you are in an emergency situation. Please note that your phone must be connected to cellular data or WiFi in order for the invisaWear to send out alerts and that contact 9-1-1 is only available in the United States. Please note, invisaWear uses your phone's cellular data or WiFi to send the alert. This can be helpful for situations where cell service is not available to make a phone call. Unfortunately if there is no data or WiFi available then the app will notify you that it was unable to send an alert and instruct you to call 911.