<\/span><\/h2>\nFor the WhatsApp Business API, Cloud API, or On-Premises, the invalid phone number error is a distinct error code, typically 131030 invalid phone number or 131042 invalid country code, returned when the number format doesn’t match E.164 standards. Unlike the consumer app, the API requires the exact plus sign, country code, and number format with no spaces, no leading zeros, and no extension digits. This fix is required in your backend.<\/span><\/p>\n\n- Validate against the E.164 regex: plus sign followed by 1 to 15 digits, with the first digit from 1 to 9.<\/span><\/li>\n
- Remove spaces, dashes, and parentheses; the API is stricter than the consumer app.<\/span><\/li>\n
- Store the number as a string, not an integer; integer columns strip leading zeros.<\/span><\/li>\n
- If you’ve migrated numbers from a virtual provider, check the provider’s number length matches the destination country’s standard.<\/span><\/li>\n
- Test with a sandbox number pair first; the API allows test numbers from an allowlist.<\/span><\/li>\n<\/ul>\n
The ITU E.164 recommendation defines the exact international format the API expects, so align your database schema to it.<\/span><\/p>\n
![\"WhatsApp](\"https:\/\/pvapins.com\/blog\/wp-content\/uploads\/2026\/09\/ChatGPT-Image-Sep-29-2026-08_58_56-AM.png\")
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