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700003: this number type isn't allowed on this line (premium, short code, international)

HTTP status: 400
Where you see it: HTTP

Why it happens

To is a premium 19xx number, a short code or an international number, and the line isn't opted in.

The error body

{
  "code": 700003,
  "message": "this number type isn't allowed on this line (premium, short code, international)",
  "more_info": "https://docs.dongleswithwings.com/errors/700003",
  "status": 400
}