Learn how phone validation blocks 94% of form spam, prevents fake account creation, and saves businesses an average of $45,000 monthly in wasted marketing spend while improving lead quality by 73%.
Initial validation to catch obvious issues before API calls:
// Client-side phone format validation
function validatePhoneFormat(phone) {
// Remove all non-numeric characters
const cleaned = phone.replace(/\D/g, '');
// Check length based on country
if (cleaned.startsWith('1') && cleaned.length === 11) {
return { valid: true, formatted: '+1' + cleaned.slice(1) };
}
return { valid: false, error: 'Invalid phone format' };
}Comprehensive validation using Phone-Check.app API:
// Full phone validation with risk scoring
async function validatePhoneNumber(phone, userIp) {
const response = await fetch('https://api.phone-check.app/v1/validate', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
'Authorization': 'Bearer YOUR_API_KEY'
},
body: JSON.stringify({
phone_number: phone,
user_ip: userIp,
checks: {
line_type: true,
carrier: true,
country: true,
risk_scoring: true,
recent_port: true
}
})
});
const data = await response.json();
// Risk-based decision logic
if (data.risk_score >= 80) {
return { blocked: true, reason: 'High risk phone number' };
}
if (data.line_type === 'voip' && data.voip_type === 'non_fixed') {
return { blocked: true, reason: 'Disposable VoIP number' };
}
return { approved: true, data };
}For high-value forms (account creation, financial applications), add SMS verification:
Analyze patterns to continuously improve protection:
• Company: B2B SaaS lead generation platform
• Volume: 25,000 monthly form submissions
• Challenge: 47% fake leads wasting $187K/month
• Solution: Phone validation with business line detection
• Company: Online retail store
• Volume: 8,400 daily orders
• Challenge: Fake accounts costing $2.6K/day
• Solution: Mobile verification with carrier checks
When implemented correctly with smart risk scoring, phone validation typically increases conversions by filtering out time-wasters and improving lead quality. Our clients see an average 23% increase in qualified leads and 73% better overall conversion rates.
Phone validation provides a seamless experience for legitimate users while effectively blocking bots. Unlike CAPTCHA which frustrates 37% of users, phone validation is invisible to genuine users and only requires a simple verification for high-risk submissions.
Yes, our API validates phone numbers in 232 countries and territories. We support international formats and can automatically detect and validate numbers from any region, making it perfect for global businesses.
Our risk scoring system differentiates between fixed VoIP (like Google Voice for business) and non-fixed VoIP (temporary numbers). Fixed VoIP numbers receive lower risk scores and can be approved based on other factors.
API integration and basic validation
Risk scoring configuration and testing
Monitor and optimize thresholds
Positive ROI within 7-10 days
Join 3,847 businesses protecting their forms with phone validation