Validate Phone Numbers in Contact Form 7
Checks Contact Form 7 phone fields for a realistic number of digits and only the characters phone numbers use, instead of accepting any text.
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Validate Phone Numbers in Fluent Forms
Checks Fluent Forms phone fields for a realistic number of digits and only the characters phone numbers use, instead of accepting any text.
Validate Phone Numbers in an ACF Field
Checks a phone number field when a post is saved and shows an error unless it has 7 to 15 digits, optionally with +, spaces, dashes and brackets.
Validate the Checkout Phone Number Format
Rejects billing phone numbers that contain letters or too few digits on the classic checkout, so you get numbers you can actually call.