1. Is SMS gateway working? I tried to have on/off event to trigger SMS with no luck

  2. What is the right format for phone number? Is it e164 (starting with country code), or North American (starting with 011), or 10 digits?

Yes, it works. Try: 1+area code and number. IE: 12125551212

I created a bug report so we can make it automatically fix the number if you don’t use the correct syntax: