Phone NumberValidation API
Validate phone numbers instantly. Get real-time carrier data, fraud scoring, and TCPA compliance checks through one API.
Carrier-sourced
Validation Accuracy
287ms
Avg Response Time
195+
Countries Supported
What One Lookup Returns
Every call cascades through five layers of signal: validity, carrier and porting history, line type, DNC status, and a fraud score. Here is what each field actually means.
POST /v1/validate/phone
One API call · ~287msValidity
"valid": true
Confirms the number is valid, active, and reachable via real-time HLR lookups and live network testing.
valid · reachable
Carrier & Porting
"ported": true
Current carrier, original carrier, OCN, LRN, and the complete porting history behind the number.
carrier · original_carrier · porting_date
Line Type
"line_type": "mobile"
Mobile, landline, or VoIP, plus network type and technology so you know exactly what you are texting or calling.
line_type · network_info
DNC Status
"dnc_status": "not_listed"
Built-in Do Not Call registry checks with real-time regulatory updates to keep outreach TCPA compliant.
dnc_status · tcpa_compliant
Fraud Score
"fraud_score": 15
A fraud score built from 50+ risk indicators, including SIM swap detection and velocity checks.
fraud_score · risk_level · fraud_indicators
Complete Phone Intelligence & Validation
Multi-layer verification for maximum accuracy and fraud prevention
Real-time Phone Validation
Instant verification of phone number validity, line status, and carrier information. Advanced HLR lookups and live network testing.
- HLR-verified accuracy
- Sub-300ms response
- Global coverage
- Live network testing
Carrier Intelligence & LRN Data
Current carrier, OCN, LRN, and network type identification with complete porting history tracking and mobile number portability intelligence.
- Complete carrier data
- Porting history
- LRN intelligence
- Network type detection
Advanced Fraud Detection
Fraud scoring with 50+ risk indicators including SIM swap detection, velocity checks, and suspicious activity patterns.
- 50+ risk indicators
- SIM swap detection
- Velocity monitoring
- Pattern analysis
DNC Registry & TCPA Compliance
Built-in Do Not Call registry checks and TCPA compliance features for SMS marketing with real-time regulatory updates.
- DNC registry checks
- TCPA compliance
- Real-time updates
- Violation prevention
Phone Validation Use Cases & Results
Real businesses achieving measurable improvements in SMS marketing and fraud prevention
SMS Marketing & Campaign Optimization
Reduce SMS bounce rates and improve campaign ROI by validating phone numbers before sending. Ensure TCPA compliance and maintain sender reputation.
- Reduce SMS bounce rates
- Improve campaign ROI
- TCPA compliance protection
- Maintain sender reputation
Customer Verification & Onboarding
Verify customer phone numbers during registration to prevent fraud and improve data quality. Reduce fake account creation and enhance security.
- Block fake registrations
- Improve data quality
- Enhance security
- Reduce support costs
Lead Generation & Sales Optimization
Qualify leads instantly by validating phone numbers. Focus sales efforts on prospects with valid, reachable contact information.
- Improve lead quality scores
- Save sales team time
- Enhance CRM data accuracy
- Prioritize valid prospects
Database Hygiene & Two-Factor Authentication
Clean customer phone databases and secure 2FA processes. Remove invalid numbers and ensure reliable authentication delivery.
- Reduce SMS service costs
- Maintain clean databases
- Secure 2FA delivery
- Improve authentication rates
Phone Validation Market Insights
Industry research and statistics driving the need for phone verification
SMS Marketing Impact
Research from MobileSquared shows that SMS marketing achieves a 98% open rate, but invalid phone numbers cost businesses up to 15% of their marketing budget.
Fraud & Compliance Costs
The Communications Fraud Control Association reports global telecom fraud losses exceed $51 billion annually, while FCC TCPA violations cost $500-$1,500 per incident.
Industries Using Phone Validation
Trusted across sectors for SMS marketing optimization and fraud prevention
Why Choose 1Lookup Phone Validation?
Accurate phone validation with carrier, fraud, and compliance data built in
Real-time HLR Validation
Live Home Location Register lookups providing the most accurate phone number status and reachability data
Multi-Signal Fraud Intelligence
50+ fraud indicators including SIM swap detection and velocity monitoring for maximum security
Built-in TCPA Compliance
Integrated DNC registry checks and compliance features to prevent costly regulatory violations
Global Carrier Intelligence
Complete carrier data, porting history, and network intelligence for optimal routing and verification
Simple Phone Validation Integration
Validation, fraud, and compliance data with a single API call
// Phone validation with fraud detection and compliance
const response = await fetch('https://api.1lookup.io/v1/validate/phone', {
method: 'POST',
headers: {
'Authorization': 'Bearer YOUR_API_KEY',
'Content-Type': 'application/json'
},
body: JSON.stringify({
phone: '+14155552671',
check_fraud: true,
check_dnc: true,
include_carrier: true,
include_porting: true
})
})
// Full response in ~287ms
{
"phone_number": "4155552671",
"country_code": "US",
"valid": true,
"reachable": true,
"line_type": "mobile",
"carrier": {
"name": "Verizon Wireless",
"code": "VZW",
"type": "mobile",
"country": "US"
},
"original_carrier": {
"name": "AT&T Mobility",
"code": "ATT"
},
"ported": true,
"porting_date": "2023-03-15T10:30:00Z",
"fraud_score": 15,
"risk_level": "low",
"fraud_indicators": {
"sim_swap": false,
"velocity_check": "normal",
"number_recycled": false,
"suspicious_activity": false
},
"dnc_status": "not_listed",
"tcpa_compliant": true,
"geography": {
"country": "United States",
"state": "California",
"city": "San Francisco",
"timezone": "America/Los_Angeles"
},
"network_info": {
"roaming": false,
"in_service": true,
"technology": "LTE"
},
"tokens_used": 2,
"processing_time_ms": 287
}Phone Validation API FAQ
Common questions about our phone verification service
Technical Specifications
- Average Response Time
- 287ms
- Validation Accuracy
- Carrier-sourced
- Fraud Indicators
- 50+ signals
- Global Coverage
- 195+ countries
- Carrier Database
- 10K+ providers
- DNC Compliance
- Built-in
Start Validating Phone Numbers Today
Join leading businesses worldwide using our phone validation API to prevent fraud, improve data quality, and ensure TCPA compliance
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