Warning - 14101
"To" Attribute is Invalid
The To attribute does not appear to be a phone number that you can SMS
- Invalid formatted number
- SMSing an un-validated number while using a Trial Account
- Check the number and make sure it is a valid 10 digit domestic phone number
- Confirm you have validated this number, if you are still using a Trial account, or upgrade your account
- Contact Twilio customer support to inquire further.