Documentation

Format Phone Numbers Before Checking

Use an international number with a country calling code. Formatting is separate from registration status: a well-formatted number can still be not found, and a malformed number can produce an unusable result.

Last reviewed: August 11, 2026

Preparing international phone numbers for WAChecker

Use a country calling code

Store each number in an international form such as +1 followed by the national number.

Do not assume a default country for mixed lists
Check whether a domestic trunk prefix must be removed
Preserve the source value in a separate column when needed

Remove display-only characters

Spaces, parentheses, and hyphens may be useful for display but can make bulk imports inconsistent.

Create a normalized working column rather than overwriting the original CRM field.

Handle duplicates and spreadsheet conversion

Deduplicate the normalized value and prevent spreadsheet software from converting long numbers to scientific notation.

Import the column as text
Remove blank rows
Check leading plus signs
Review a small sample after export

Ready to test WAChecker?

Start with a small, correctly formatted list you are authorized to process.

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