Wow, ok. I've been hit with this issues twice and both times, the Twilio reps failed to let me know about this. I had previously resorted to just turning off any counties. Looks like mu international app users might get functionality back.... if this feature is still live.
Thank you. I can't believe I missed this API parameter when I was looking to solve our toll fraud issue a few years ago.
Do you happen to know which MaxPrice number would make sense for simple SMS? Figuring it out a reasonable value to use from Twilio's pricing pages is proving quite tricky, because of the amount of dimensions to their pricing.