---
title: "Phone Number Inspector & Technical Validator"
---

Phone Number Inspector & Technical Validator: SMSRiver

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- Phone Number Inspector

Phone-Number Intelligence

# Phone Number Inspector & Technical Validator

Analyze numbering-plan compliance, classify line types (mobile, landline, VoIP, toll-free), resolve country and carrier attribution, and convert raw phone numbers into standardized formats.

Try illustrative examples:
[US Cellular (+1 415)](?phone=%2B14155552671&country=US)
[UK Mobile (+44 7911)](?phone=%2B447911123456&country=GB)
[Germany Mobilfunk (+49 151)](?phone=%2B491512283200&country=DE)
[US Toll-Free (+1 800)](?phone=%2B18005550199&country=US)
[France Mobile (+33 6)](?phone=%2B33612345678&country=FR)

Phone Number Input

Default Country Context

Australia (+61)

Austria (+43)

Belgium (+32)

Brazil (+55)

Canada (+1)

France (+33)

Germany (+49)

India (+91)

Indonesia (+62)

Ireland (+353)

Italy (+39)

Japan (+81)

Mexico (+52)

Netherlands (+31)

Philippines (+63)

Poland (+48)

Singapore (+65)

South Africa (+27)

South Korea (+82)

Spain (+34)

Sweden (+46)

Switzerland (+41)

United Kingdom (+44)

United States (+1)

Inspect Phone Number

Real-time local evaluation • Zero external API delay

Inspection Report •

Valid Numbering Plan

Wireless / Cellular

## +1 415 555 2671

US •

E.164 Format

+14155552671

Copy E.164

International

+1 415 555 2671

Copy International

National Local

(415) 555-2671

Copy National

RFC 3966 URI

tel:+14155552671

Copy RFC 3966

### Technical Classification & Telephony Parameters

ITU-T E.164 Specification

Line Classification
Wireless / Cellular

Classification Confidence
medium

Allocated Carrier / Operator
Tier-1 US Wireless Operator (AT&T/Verizon/T-Mobile)

Geographic Region
San Francisco, CA

Country / Market
(US)

Dialing Code

Supported Capabilities

SMS
• Voice
• MMS

Numbering-Plan Compliance

Compliant

Engineering Notes: Geographic NPA 415 (San Francisco, CA). Assigned to standard wireless or wireline pool.

#### Technical Distinction: Format Validity vs. Active Subscriber Assignment

Format and numbering-plan validity confirms the phone number strictly conforms to national telecom regulator specifications. It does not guarantee that the line is currently active, assigned to a subscriber, or reachable without real-time carrier signaling. Line-type classification and carrier attribution are derived from authorized national destination code prefixes and regulatory allocations. Carrier porting (LNP) and active subscriber connection require live network signaling.

### Related Developer Testing & Verification Workflows

[SMS Segment Calculator
Calculate segment counts, character splits, and carrier costs for this message.](/tools/sms-segment-calculator/?text=Your%20verification%20code%20is%20123456)
[Webhook Validator
Validate JSON payloads and signatures against Twilio, Telnyx, and SMSRiver schemas.](/tools/webhook-payload-validator/)
[Public Inboxes
Test live SMS verification using active US phone numbers with real inboxes.](/receive-sms/us/)

## Frequently Asked Questions

### What is the difference between an E.164 valid number and an active line?

An E.164 valid number conforms to the international standard for country code, area prefix, and digit count. However, formatting alone does not guarantee the line is currently connected to a cellular tower or assigned to an active subscriber.

### How does SMSRiver determine line types like VoIP vs Mobile?

Line types are determined using official national prefix allocation records (such as FCC/NANPA in the US and BNetzA in Germany). Cellular blocks and known VoIP allocations are mapped to classify the line.

### Can I integrate phone number lookups into my API or CI pipeline?

Yes. SMSRiver provides a dedicated REST endpoint at /api/v1/lookup/ and batch processing at /api/v1/lookup/batch/.

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FULL PACKET INSPECTION
SMS

### Line: DE +49 ...

Timestamp: Just now

Extracted code

Copy Code

Message Body:

Copy Full Message

[Open Live Inbox](#)

smsriver.com

Central Office carrier inventory platform & developer SMS verification sandbox. Receive OTP codes instantly with zero SIM card requirement.

Public numbers·Live inboxes·Developer tools

Public Inboxes

- [United States (+1)](/receive-sms/us/)

- [United Kingdom (+44)](/receive-sms/gb/)

- [Canada (+1)](/receive-sms/ca/)

- [Philippines (+63)](/receive-sms/ph/)

- [Germany (+49)](/receive-sms/de/)

Developer & Tools

- [SMS Debugging Workbench](/workbench/)

- [Phone Number Inspector](/tools/phone-number-inspector/)

- [Bulk Phone Validator](/tools/bulk-phone-validator/)

- [Phone Lookup API](/developer/phone-lookup-api/)

- [E.164 Phone Formatter](/tools/phone-number-formatter/)

- [SMS Segment Calculator](/tools/sms-segment-calculator/)

- [Webhook Validator](/tools/webhook-payload-validator/)

Guides & Trust

- [Country Calling Codes](/country-codes/)

- [Troubleshooting Hub](/troubleshooting/)

- [Carrier Comparisons](/compare/)

- [Developer Reference](/developer/)

- [OpenAPI Specification](/openapi.json)

- [MCP Tools Manifest](/.well-known/mcp.json)

- [Privacy & Security Guides](/guides/)

- [Engineering Articles](/articles/)

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