Georgia Phone Numbers: Format, Area Code & Validation Guide

This guide provides a detailed overview of Georgia's phone numbering system, designed for developers, telecom professionals, and system administrators. It covers number formats, validation, best practices, and advanced implementation considerations.

Quick Reference

• Country: Georgia 🇬🇪
• Country Code: +995
• International Prefix: 00
• National Prefix: 0
• E.164 Format Length: 12 digits total (3-digit country code +995 + 9-digit national number)
• National Number Length: 9 digits (uniform since June 4, 2011)
• ITU-T Standard: E.164
• Regulatory Authority: Georgian National Communications Commission (GNCC)
• Time Zone: UTC+4 (Georgia Standard Time), no daylight saving time since 2004

Numbering Plan Overview

Georgia uses a closed numbering plan, adhering to the ITU-T E.164 standard. All numbers are 9 digits long, including the area/service code. This standardized format was implemented on June 4, 2011, simplifying previous variations and improving compatibility. The reform included updating area codes, standardizing mobile prefixes, and padding some geographic numbers to ensure a uniform 9-digit length.

Number Categories and Formats

Georgian phone numbers fall into several categories:

1. Geographic (Landline) Numbers

• Format: 0[3-5][1-9] XXXXXX (Note: Not all combinations within this range are valid area codes. See the area code table below for details.)
• Example: 032 234 5678 (Tbilisi)

Geographic numbers start with 0 followed by a two or three-digit area code. The area code's first digit (3 or 4) indicates the region: 3 for eastern Georgia and 4 for western Georgia.

Major City Area Codes:

• Tbilisi: 032
• Kutaisi: 043
• Batumi: 042
• Rustavi: 0341

A more comprehensive list of area codes can be found in the Additional Context.

2. Mobile Numbers

• Format: 5XX XXX XXX
• Example: 595 123 456

Mobile numbers always begin with 5 followed by eight more digits (total 9 digits). While the second and third digits historically indicated the operator (e.g., 595 for MagtiCom), number portability has been available since February 15, 2011, making prefix-based operator identification unreliable.

Valid Mobile Prefixes (5XX): Blocks allocated to operators include 511, 514, 551, 555, 557, 558, 559, 568, 570, 571, 574, 577, 578, 579, 591, 592, 593, 595, 596, 597, 598, and 599. Not all 500-599 ranges are currently assigned.

SMS and MMS Capability: Georgian mobile networks support standard SMS messaging with GSM-7 encoding (160 characters) and Unicode (70 characters). MMS messages are automatically converted to SMS with embedded URL links for compatibility across all devices.

3. Special Purpose Numbers

• Toll-Free: 800 XXX XXX (Used for customer service, government helplines)
• Premium Rate: 900 XXX XXX (Used for pay-per-call services)
• Emergency/Special Services: 1XX (e.g., 112 for general emergency)

Emergency Numbers:

• 112 - Unified emergency number (Police, Ambulance, Fire/Rescue) - operational 24/7 since 2012
• 125 - Property Security Police

Legacy emergency numbers (111 Fire, 113 Medical, 122 Patrol Police) were transitioned to the unified 112 system but may still function during transition periods.

4. Reserved Numbers

• Prefixes: 2XX, 6XX (Currently reserved for future use)

Implementation Guide

1. Number Validation

Regular expressions provide a robust way to validate Georgian phone numbers:

// Mobile - validates 5XX format with proper prefix ranges
const mobileRegex = /^5(11|14|51|55|57|58|59|68|70|71|74|77|78|79|91|92|93|95|96|97|98|99)\d{6}$/;

// Geographic (More precise validation requires a lookup table of valid area codes)
const landlineRegex = /^0[34]\d{1,2}\d{6,7}$/; // Accommodates 2 or 3 digit area codes

// Toll-Free
const tollFreeRegex = /^800\d{6}$/;

// Premium Rate
const premiumRegex = /^900\d{6}$/;

// Emergency
const emergencyRegex = /^1(12|25)$/;

Important Note: The landlineRegex provided here is a general match. For precise validation, you should cross-check the area code against a list of valid Georgian area codes from the ITU numbering plan.

Validation Approach Comparison:

• Regex: Fast, no dependencies, good for format validation, but limited for operator identification
• Libraries (libphonenumber): Comprehensive validation, operator detection, formatting support, but adds dependency size
• API Services: Real-time portability data, operator lookup, but requires network calls and rate limits

2. Number Formatting

Consistent formatting improves user experience. Here's an example function:

function formatGeorgianNumber(number) {
  const cleaned = number.replace(/\D/g, ''); // Remove non-digits

  if (cleaned.startsWith('5')) {
    return `+995 ${cleaned.slice(0, 3)} ${cleaned.slice(3, 6)} ${cleaned.slice(6)}`; // Mobile
  } else if (cleaned.startsWith('0')) {
    // Landline (formatting depends on area code length - requires area code lookup)
    const areaCodeLength = getAreaCodeLength(cleaned); // Function to determine area code length (not shown here, but crucial)
    if (areaCodeLength === 2) {
        return `+995 ${cleaned.slice(1, 3)} ${cleaned.slice(3)}`;
    } else if (areaCodeLength === 3) {
        return `+995 ${cleaned.slice(1, 4)} ${cleaned.slice(4)}`;
    } else {
        return null; // Invalid area code length
    }
  } else if (cleaned.startsWith('800') || cleaned.startsWith('900')) {
    return `+995 ${cleaned.slice(0, 3)} ${cleaned.slice(3, 6)} ${cleaned.slice(6)}`; // Special numbers
  }

  return null; // Invalid format
}

// Helper function for area code length determination
function getAreaCodeLength(number) {
  const areaCode2 = number.slice(1, 3);
  const areaCode3 = number.slice(1, 4);

  // 2-digit area codes (32 Tbilisi, 42 region)
  const twoDigit = ['32', '42'];
  if (twoDigit.includes(areaCode2)) return 2;

  // 3-digit area codes start with 3 or 4
  if (number.startsWith('03') || number.startsWith('04')) {
    return 3;
  }

  return null; // Invalid
}

3. Operator Identification

While prefixes like 595 were initially tied to specific operators, number portability has made this unreliable. For accurate operator identification, use a real-time lookup service. The GNCC may offer such a service, or you can use third-party providers.

Current Mobile Operators (2024-2025):

• MagtiCom - Leading operator, best coverage (prefixes: 591, 595, 598, 599, 551, 511, 596)
• Silknet (formerly Geocell) - Second largest (prefixes: 577, 593, 555, 557, 558, 514)
• Cellfie (formerly Beeline) - Third operator (prefixes: 579, 568, 571, 592, 597)

Best Practices

• Storage: Store numbers in E.164 format (+995XXXXXXXX) without spaces or formatting.
• Display: Use local format (0XX XXXXXX) for domestic users and international format (+995 XX XXXXXXX) for international contexts.
• Validation: Always validate before processing, considering length, prefixes, and potentially area code validity.
• Portability: Do not rely on prefixes for operator identification. Use a lookup service.
• User Input Handling:
  • Strip all non-numeric characters before validation
  • Support paste with international format (+995)
  • Provide autocomplete for common area codes
  • Display formatting hints: "e.g., 595 123 456"
  • Allow international dialing prefix (00 or +)

Advanced Implementation

Error Handling

Implement custom error classes for specific issues:

class GeorgianNumberError extends Error {
  constructor(message, numberType, attemptedValue) {
    super(message);
    this.name = 'GeorgianNumberError';
    this.numberType = numberType; // e.g., 'mobile', 'landline', 'portability'
    this.attemptedValue = attemptedValue;
  }
}

// Example usage
function validateGeorgianMobile(number) {
  const cleaned = number.replace(/\D/g, '');

  if (cleaned.length !== 9) {
    throw new GeorgianNumberError(
      `Invalid length: expected 9 digits, got ${cleaned.length}`,
      'mobile',
      number
    );
  }

  if (!cleaned.startsWith('5')) {
    throw new GeorgianNumberError(
      'Mobile numbers must start with 5',
      'mobile',
      number
    );
  }

  const prefix = cleaned.slice(0, 3);
  const validPrefixes = ['511','514','551','555','557','558','559','568','570','571','574','577','578','579','591','592','593','595','596','597','598','599'];

  if (!validPrefixes.includes(prefix)) {
    throw new GeorgianNumberError(
      `Invalid mobile prefix: ${prefix}`,
      'mobile',
      number
    );
  }

  return true;
}

User-Facing Error Messages:

• Length error: "Please enter a 9-digit phone number"
• Invalid prefix: "Mobile numbers must start with 5"
• Invalid format: "Please use format: 595 123 456"

Number Portability Integration

Integrate with a portability API (if available) for real-time operator lookup:

async function getOperator(phoneNumber) {
  try {
    const response = await fetch(`https://example-portability-api.com/${phoneNumber}`, {
      headers: {
        'Authorization': `Bearer ${API_KEY}`,
        'Content-Type': 'application/json'
      }
    });

    if (!response.ok) {
      throw new GeorgianNumberError('Portability lookup failed', 'portability', phoneNumber);
    }

    const data = await response.json();
    return {
      operator: data.operator_name,
      original_operator: data.original_operator,
      ported: data.is_ported,
      last_updated: data.timestamp
    };
  } catch (error) {
    throw new GeorgianNumberError('Portability lookup failed', 'portability', phoneNumber);
  }
}

Rate Limiting Considerations: Most portability APIs limit requests to 100-1000/minute. Implement caching and batch processing for high-volume scenarios.

Performance Optimization

• Caching: Cache operator and portability data to reduce API calls. Implement appropriate TTLs (Time-To-Live) based on data volatility.
  • Recommended TTLs:
    • Operator lookups: 24-48 hours (portability data changes infrequently)
    • Validation results: 1-7 days
    • Area code lists: 30-90 days (rarely change)
• Batch Processing: Validate or process numbers in batches to improve efficiency when dealing with large volumes.

Regulatory Compliance

Adhere to GNCC regulations and data protection requirements:

• Store numbers in E.164.
• Implement robust error handling.
• Maintain audit logs for number modifications.
• Stay updated on current number plans and regulations via the GNCC website.
• Consent Requirements: Obtain explicit written consent before storing or processing phone numbers for marketing purposes. Document consent with timestamp, source, and specific opt-in campaign.
• Data Retention: Follow Georgian telecommunications law for retention periods. Implement right-to-deletion workflows within 30 days of user request.
• Security: Encrypt phone numbers at rest and in transit. Limit access to authorized personnel only.

Additional Context

The provided additional context offers valuable details on Georgian telecommunications, including:

• Area Codes: A more extensive list of area codes is available in the Wikipedia excerpt. Use this for comprehensive landline validation.
• Mobile Operators: Information on mobile operators and their historical prefixes is provided. Remember that number portability makes prefix-based identification unreliable.
• Market Dynamics: The additional context includes information on market share, competition, and regulatory changes. This is useful for understanding the broader telecommunications landscape in Georgia.
• Number Portability: Details on the implementation and implications of number portability are crucial for developers.

By understanding these details and following the best practices outlined in this guide, you can effectively integrate Georgian phone numbers into your applications and systems.