Phone AppendAPI
Append verified phone numbers using name and address data. High-quality consumer intelligence with confidence scoring and compliance-friendly enrichment.
High Quality
Match Accuracy
10 tokens
Per Request
Datazapp
Data Source
Complete Phone Enrichment Platform
Multi-field matching for maximum accuracy and reachability
Verified Carrier Intelligence
Uses trusted consumer and carrier data to append reachable phone numbers tied to provided identity fields. Datazapp-powered matching.
Confidence Scoring
Returns confidence indicators so you can decide when to auto-accept, review, or retry records. Quality transparency built-in.
Multi-Field Matching
Name + address matching improves accuracy and reduces false positives compared to single-field lookups. Multiple signals for best results.
Quality Insights
Provides match status and quality context to keep CRMs clean and campaigns compliant. Transparent match reasoning.
Phone Append Use Cases & Results
Real businesses achieving measurable improvements with phone enrichment
Lead Reachability
Append missing phone numbers on inbound leads to unlock SMS and voice outreach channels immediately.
- SMS outreach unlock
- Voice channel access
- Faster follow-up
- Higher contact rates
CRM Backfill
Enrich legacy CRM records and keep sales, support, and billing teams aligned on best contact methods.
- Legacy data recovery
- Team alignment
- Complete records
- Better routing
Compliance-Aware Outreach
Use confidence and status metadata to respect compliance and avoid bad dials. Quality signals for safe campaigns.
- Compliance support
- Bad dial reduction
- Status awareness
- Safe outreach
Customer 360
Build complete customer profiles by appending verified phones. Enable omnichannel communication strategies.
- Profile completion
- Omnichannel enablement
- Identity resolution
- Better personalization
Industries Using Phone Append
Trusted across sectors for contact enrichment
Why Choose 1Lookup Phone Append?
Premium data quality with transparent pricing
Premium Consumer Database
Access to Datazapp consumer intelligence with billions of records
Confidence Scoring
Every match includes quality indicators for trust decisions
Address Normalization
Built-in address cleaning improves match rates
Transparent Pricing
Simple 10 tokens per request with no hidden fees
Simple Phone Append Integration
Enrich contacts with a single API call
// Phone append from name and address
const response = await fetch('https://api.1lookup.io/api/lookup', {
method: 'POST',
headers: {
'Authorization': 'Bearer YOUR_API_KEY',
'Content-Type': 'application/json'
},
body: JSON.stringify({
type: 'phone-append',
firstName: 'John',
lastName: 'Doe',
address: '456 Oak Avenue',
city: 'Dallas',
zip: '75201'
})
})
// Response
{
"success": true,
"phone": "+12145551234",
"confidence": 0.82,
"line_type": "mobile",
"tokens_used": 10
}Phone Append API FAQ
Common questions about our phone enrichment service
Our phone append API requires first name, last name, street address, city, and ZIP code. The more accurate your input data, the higher the match rate.
Match rates vary based on input quality, typically 30-50% for consumer records. Each result includes confidence scores to help prioritize which numbers to use.
Phone append returns the best-matching number from our consumer database. We recommend pairing with our Phone Validation API for line type and carrier verification.
If no match is found, the API returns a no-match response. You are still charged for the lookup attempt as the database search was performed.
Technical Specifications
Token Cost
10 tokens
Data Source
Datazapp
Match Rate
30-50%
Input Fields
5 required
Confidence
Included
Response
Real-time
Start Enriching Contacts Today
Append verified phone numbers to your contact database with confidence scoring
100 free credits • Setup in 5 minutes • Premium support