The definitive guide to phone validation. Learn advanced techniques used by industry leaders to maintain 99.6% accuracy rates across 232 countries.
Learn everything about phone validation, from basic format checking to advanced carrier detection and fraud prevention techniques.
Phone validation is a sophisticated process that verifies phone numbers before sending SMS campaigns. It combines multiple verification techniques including format checking, carrier detection, line type analysis, and fraud prevention to ensure your SMS messages reach real mobile devices.
Industry Fact:
18% of phone numbers entered online contain typos or are invalid. Without validation, nearly 1 in 5 SMS messages will fail, wasting your marketing budget and damaging delivery rates.
Invalid phone numbers waste SMS credits. Carriers track failure rates and throttle senders with high invalid rates.
Stop paying for invalid numbers. Most SMS providers charge per message - validation saves thousands monthly.
Clean phone lists have higher delivery rates (98% vs 82%) and response rates (12% vs 4%) than unvalidated lists.
High failure rates trigger carrier blocks. Validation ensures your messages reach recipients, not spam folders.
Validates phone number structure against international E.164 standards. Checks for valid digits, country codes, and proper formatting.
✅ Valid: +1 (555) 123-4567❌ Invalid: 123-45-678910Verifies country code and regional formatting. Checks against 232+ country phone number patterns and mobile number ranges.
Identifies the mobile network operator and line type. Determines if it's mobile, landline, VoIP, or premium rate number.
Carrier: Verizon Wireless
Line Type: Mobile
Connects to carrier networks to verify number status and reachability. Uses HLR/HSS lookups to confirm the number is active and can receive SMS.
Advanced fraud detection including VoIP identification, temporary number detection, spam trap recognition, and deliverability scoring.
High Risk:
VoIP, temporary, fraud patterns
Low Risk:
Mobile, verified, active
25% of numbers are VoIP or virtual, making SMS delivery unpredictable and costly.
Solution: Use carrier detection, line type analysis, and fraud scoring to identify reliable mobile numbers.
30% of numbers have been ported between carriers, causing outdated carrier information.
Solution: Use real-time HLR lookups and number portability databases for accurate carrier detection.
Major carriers limit HLR lookup requests to prevent network abuse.
Solution: Use distributed validation networks, intelligent caching, and carrier relationship management.
GDPR, CCPA, and TCPA regulations restrict how phone numbers can be validated and used.
Solution: Use compliant validation methods, maintain audit logs, and respect consent requirements.
Validate phone numbers instantly at form submission to prevent bad data entry.
Re-validate lists every 6 months - 25% of phone numbers change annually.
Combine validation with SMS verification codes for maximum accuracy.
Track delivery rates, response rates, and validation metrics daily.
Remove invalid numbers instantly to protect sender reputation.
Treat risky numbers differently - avoid VoIP, prioritize mobile carriers.
Add real-time validation to forms with JavaScript SDK.
phoneCheck.validate(phoneNumber)Validate thousands of phone numbers via CSV upload or API.
GET https://api.ip-info.app/v1-get-phone-details?phone=NUMBERGet real-time notifications for validation results.
webhook.subscribe('validation')Based on average list of 100,000 phone numbers with 18% invalid rate
Our validation achieves 99.6% accuracy using multiple verification layers including HLR lookups, reducing false positives to near zero.
No. Our API responds in under 50ms on average. Users won't notice any delay during form submission.
Yes. Process up to 1 million phone numbers per batch via CSV upload or API, with results typically ready in minutes.
Yes. We're fully GDPR, CCPA, and TCPA compliant. Validation doesn't store personal data and all processes are privacy-safe.
Join 50,000+ companies reducing SMS costs by 40%
No credit card required • 500 free phone validations monthly