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Course → Module 1: Identity Consistency: NAP and Beyond
Session 4 of 7

Phone, Email, and Secondary Identifiers

Session 1.4 · ~5 min read

Name and address are the first two pillars of NAP. This session covers the third pillar (phone) and extends the concept to secondary identifiers: email, website URL, and social handles. Each of these is a data point Google uses to identify, verify, and connect your entity across the web.

Phone Numbers as Entity Identifiers

A phone number is one of the strongest entity identifiers available. Unlike names (which can be shared by multiple entities) or addresses (which can house multiple businesses), a phone number maps to a single entity. When Google finds the same phone number across your website, your GBP, and multiple directories, it can confidently link all those mentions to one entity.

But phone number formatting varies widely, and each format variation is a different string to a matching algorithm.

Format Example (Indonesian) Example (US) Notes
International (E.164) +6221555123 +12125551234 No spaces, no dashes. Machine-readable. Recommended for schema markup.
International with spaces +62 21 555 1234 +1 212 555 1234 Human-readable. Good for display. Must be consistent.
Local with area code 021-555-1234 (212) 555-1234 No country code. Fine for domestic-only entities. Avoid mixing with international.
Local without area code 555-1234 555-1234 Ambiguous. Avoid on any platform.
WhatsApp format +62 812-3456-7890 N/A Common in Indonesia. If you use WhatsApp as a business line, include this as a secondary number.

Choosing Your Canonical Phone Format

Pick one format and use it everywhere. The recommended approach:

  1. Schema markup / structured data: Use E.164 format (no spaces, no dashes, with country code). Example: +6221555123
  2. Display on website and profiles: Use international format with spaces. Example: +62 21 555 1234
  3. On your GBP: Match the display format exactly.

The critical rule is that the display format must be identical across all platforms. If your website shows "+62 21 555 1234" and your Yelp listing shows "(021) 555-1234," those are two different strings and Google has to reconcile them.

graph TD A["Primary phone: +62 21 555 1234"] --> B[Website footer] A --> C[Google Business Profile] A --> D[LinkedIn] A --> E[All directories] A --> F[Social profiles] G["Schema markup: +6221555123"] --> H["JSON-LD telephone property"] I["Secondary: +62 812-3456-7890
(WhatsApp)"] --> J[Website contact page] I --> K[GBP secondary phone] style A fill:#2a2a28,stroke:#c8a882,color:#ede9e3 style G fill:#2a2a28,stroke:#6b8f71,color:#ede9e3 style I fill:#2a2a28,stroke:#8a8478,color:#ede9e3

Email as an Entity Signal

Email addresses serve two functions for entity recognition. First, they are identifiers that can link mentions together (similar to phone numbers). Second, the domain of the email address is a trust signal.

A branded email address (info@yourdomain.com) tells Google your entity controls a domain. A free email (yourbrand@gmail.com) tells Google nothing about domain ownership.

The distinction matters because Google uses domain ownership as one of its entity verification signals. When your website is at yourdomain.com and your contact email is info@yourdomain.com, that is a corroborating signal. When your email is yourname@gmail.com, there is no connection to your website domain.

Identifier Type Format Rule Entity Signal Strength Where to Display
Primary email Branded domain (info@yourdomain.com) Strong (confirms domain ownership) Website, GBP, directories, structured data
Personal email (for Person entities) Branded domain (name@yourdomain.com) Strong Author pages, speaker profiles
Free email (Gmail, Yahoo, etc.) Avoid as primary Weak (no domain connection) Only as a secondary if needed
Website URL https:// with consistent www/non-www Strong (this IS the entity home) Everywhere. This is the most important identifier.
Social handles Consistent across platforms when possible Medium (supports entity linking) Cross-linked between profiles

Website URL Consistency

Your website URL is technically the most important identifier because it serves as your entity home. Google treats the URL on your website as the canonical reference point for your entity.

URL consistency problems are surprisingly common:

In your structured data, your website URL appears in the url property. On every external platform, the URL you link to should be the same version. If your site redirects www to non-www, use the non-www version everywhere.

Social Handles

Social media handles are secondary identifiers. They are less powerful than phone, email, or URL, but they contribute to entity recognition when they are consistent and properly linked.

The ideal scenario: your social handle is identical across platforms (e.g., @yourbrand on Twitter/X, Instagram, LinkedIn, Facebook, YouTube). When Google finds the same handle across multiple platforms, all linking back to the same website, it strengthens the entity cluster.

The radar chart shows the relative entity signal strength of each identifier type. Website URL and GBP listing are the strongest. Branded email is strong because it confirms domain ownership. Social handles are moderate. Free email is nearly worthless as an entity signal.

The Complete Identifier Inventory

By the end of this session, your master NAP record should include all of the following:

  1. Canonical entity name
  2. Canonical address (or geographic scope for service-area businesses)
  3. Primary phone number (display format)
  4. Primary phone number (E.164 format for schema)
  5. Secondary phone number (if applicable, e.g., WhatsApp)
  6. Primary email (branded domain)
  7. Website URL (canonical, with protocol)
  8. Social handles (list each platform and handle)

This document is your identity anchor for every future session in this course. Whenever you create a new listing, update a profile, or add structured data, you pull from this master record.

Further Reading

Assignment

  1. Add phone, email, URL, and social handles to your master NAP record. Use the format rules from this session.
  2. Check your phone number format across five platforms. Record the exact string on each. Note any format differences.
  3. Check whether you are using a branded email (yourdomain.com) or a free email (gmail.com, yahoo.com) as your primary contact. If free, plan to set up a branded email.
  4. List all your social media handles. Are they consistent? If they differ across platforms, note which version is canonical.