E.164 Standard
Normalize valid numbers to E.164 and national formats with structural format checks.
Phone Validation API
Validate and normalize phone numbers to E.164. Get line type, location, carrier, and dialability flags for signup forms and contact cleanup — not live line verification.
API endpoint
GET https://phonevalidation.cleariflow.com/v1/?api_key=YOUR_API_KEY&country=US&phone=%2B14155552671
Try it now
Test the API with live data
API benefits
Global Coverage
Support for phone numbers from over 240 countries and territories worldwide.
Location & Timezones
Location hints and timezone identifiers when available (most often US/CA).
Carrier Details
Carrier names and safe display names when available — mainly US/CA. Not subscriber verification.
Number Type Detection
Classify landline, mobile, toll-free, VoIP, and other line types when valid.
Real-time Validation
Instant structural phone validation with sub-200ms response times.
Key features
- E.164 format validation
- 240+ countries supported
- Structural format validation
- Lenient possible-number check
- Invalid reason codes for failed parses
- Carrier name when available (mainly US/CA)
- Safe carrier name for UI display
- Number type classification
- Location hints (mainly US/CA)
- Timezone identifiers per number
- Geographic region association
- International dialability flag
- International format conversion
- Local format conversion
- Mobile vs fixed-line detection
- VoIP number identification
- JSON response format
Quick start guide
1. Get your API key
Sign up for free and get instant access to your API key.
2. Make your first request
cURL
curl -X GET \ "https://phonevalidation.cleariflow.com/v1/" \ ?api_key=YOUR_API_KEY \ &phone=%2B14155552671 \ &country=US
3. Handle the response
JSON
{
"carrier": "",
"carrier_display": "",
"country": {
"code": "US",
"name": "United States",
"prefix": "+1"
},
"format": {
"international": "+14155552671",
"local": "(415) 555-2671"
},
"geographical": true,
"internationally_dialable": true,
"location": "San Francisco, CA",
"phone": "14155552671",
"possible": true,
"timezones": [
"America/Los_Angeles"
],
"type": "Landline_or_Mobile",
"valid": true
}
Free
Monthly
€0
100 requests/month
- REST API access
- Up to 1 requests/sec
- Core documentation
Starter
Monthly
€6
5,000 requests/month
- Everything in Free
- Up to 3 requests/sec
- Billed as shown in your account
Standard
Monthly
€12
50,000 requests/month
- Everything in Free
- Up to 10 requests/sec
- Billed as shown in your account
Professional
Monthly
€24
150,000 requests/month
- Everything in Free
- Up to 25 requests/sec
- Billed as shown in your account
Starter
Annually
€65
60,000 requests/year
- Everything in Free
- Up to 3 requests/sec
- Billed annually as shown in your account
Standard
Annually
€130
600,000 requests/year
- Everything in Free
- Up to 10 requests/sec
- Billed annually as shown in your account
Professional
Annually
€259
1,800,000 requests/year
- Everything in Free
- Up to 25 requests/sec
- Billed annually as shown in your account