You can call using TextMe from anywhere!
Just make sure to use wifi to avoid data roaming charges.
Using your cellular while abroad will generally cause additional charges by your mobile provider.
You should deactivate data roaming while traveling. To do so, go to :
- Settings (from your device's home screen)
- Toggle Cellular Data to be off
- And open Cellular Data options
- Choose "Off" for both Enable LTE and Roaming.
With Wi-Fi, it is totally free!