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1xxx — Client Errors

1002: Phone number must be in E.164 format

1002: Phone number must be in E.164 format

Phone numbers must conform to E.164 format (e.g., +14155551234).

Phone numbers must conform to E.164 format (e.g., +14155551234). This is an HTTP 400 error indicating the phone number in your request is not properly formatted.

Troubleshooting

Include the country code with a + prefix (e.g., +14155551234 for a US number)
Remove any spaces, dashes, or parentheses from the phone number