When I try to send SMS to US number I'm getting from API accept but message not sent. In clickatell I see "routing error"
Same message to number outside of US is working fine.
I have no 2-way number configured - is it a must? Any other ideas?
Legislation in the US requires the use of a 2-way number if you are communicating via text with customers in this region. This is the likely cause of your routing error.
Hope this helps!