What is the country code for Slovakia?

The country code for Slovakia is +421.

How are mobile numbers structured in Slovakia?

Slovak mobile numbers typically start with the digit 9 and have a fixed length of 9 digits, following the format +421 9XX XXX XXX.

What are the dialing procedures for international calls to Slovakia?

To call Slovakia from abroad, dial the international prefix (usually 00), followed by Slovakia's country code (+421), the area code (without the leading 0), and then the subscriber number. For example, to call a Bratislava number, you would dial +421 2 XXX XXXX.

Is number portability supported in Slovakia?

Yes, Slovakia supports mobile number portability (MNP), allowing users to retain their mobile numbers when switching between different service providers.

What are the major telecom operators in Slovakia and their associated number ranges?

The major telecom operators in Slovakia are Slovak Telekom, Orange Slovakia, O2 Slovakia, and 4ka (SWAN Mobile). Each operator has specific mobile and fixed-line prefixes, such as 0901-0904 for Slovak Telekom and 0911-0915 for Orange Slovakia.

What is the country code for Slovakia?

The country code for Slovakia is +421.

How do I dial a Slovak landline number from abroad?

To dial a Slovak landline number from abroad, use the international prefix followed by Slovakia's country code and the area code without the leading zero, then the subscriber number. For example, +421 2 123 4567 for Bratislava.

What is the format for Slovak mobile phone numbers?

Slovak mobile phone numbers start with 9 and are formatted as +421 9XX XXX XXX.

How are toll-free numbers formatted in Slovakia?

Toll-free numbers in Slovakia begin with 800 and are formatted as +421 800 XXX XXX.

What is the international dialing prefix for Slovakia?

The international dialing prefix for Slovakia is 00.

Can I keep my phone number if I switch providers in Slovakia?

Yes, Slovakia supports mobile number portability, allowing you to keep your phone number when switching providers.

What are premium rate numbers in Slovakia?

Premium rate numbers in Slovakia start with 90X and are used for services with additional charges. They are formatted as +421 90X XXX XXX.

How are shared cost numbers identified in Slovakia?

Shared cost numbers in Slovakia start with 85X-89X and are formatted as +421 8[5-9]X XXX XXX.

What are the major telecom operators in Slovakia?

The major telecom operators in Slovakia are Slovak Telekom, Orange Slovakia, O2 Slovakia, and 4ka (SWAN Mobile).

How can I block a specific phone number in Slovakia?

Users can block specific phone numbers through their telecom provider for security or privacy reasons.

What should developers consider when working with Slovak phone numbers?

Developers should consider validation using regex, normalization by removing non-numeric characters, handling number portability, and enforcing length constraints based on number type.

What does a Slovak geographic number look like?

A Slovak geographic number includes a 2-digit area code followed by the subscriber number, formatted as +421 2 XXX XXXX for Bratislava, for example.

How do I make a domestic call from a Slovak landline to a mobile?

To call a mobile from a landline in Slovakia, dial the mobile prefix followed by the subscriber number, e.g., 0903 456 789.

What is a 'golden number' in Slovakia?

A 'golden number' is a memorable phone number with repeating digits, which may be sold at a premium.

How are Slovak phone numbers allocated and managed?

The Regulatory Authority for Electronic Communications and Postal Services (RÚ) is responsible for the allocation and management of phone numbers in Slovakia.

What is the national prefix for dialing within Slovakia?

The national prefix for dialing within Slovakia is 0.

What is the regular expression for validating Slovak mobile numbers?

The regular expression for validating Slovak mobile numbers is ^\+4219\d{8}$.

How do I dial a Slovak toll-free number from abroad?

To dial a Slovak toll-free number from abroad, use the international prefix, Slovakia's country code, and the toll-free number without the leading zero, e.g., +421 800 123 456.

Phone Numbers in Slovakia: A Comprehensive Guide

Quick Reference

Country: Slovakia
Country Code: +421
International Prefix: 00
National Prefix: 0
Regulatory Body: Regulatory Authority for Electronic Communications and Postal Services (RÚ)

Overview

This guide offers an in-depth look at Slovakia's telephone numbering system, covering number formats, dialing procedures, and regulatory details. It is tailored for telecom professionals, developers, and systems administrators who need to understand Slovak phone numbers thoroughly.

Number Formats

General Structure

Slovak phone numbers have a fixed-length format based on the service type. The structure includes the country code (+421), followed by an area code or prefix, and the subscriber number.

Country Code: +421
Area Code/Prefix: 1-2 digits (varies by region or service)
Subscriber Number: 6-8 digits

Geographic Numbers

Geographic numbers are specific to Slovak regions and typically have a 2-digit area code.

Type	Format	Example
Bratislava	`+421 2 XXX XXXX`	+421 2 123 4567
Košice	`+421 55 XXX XXXX`	+421 55 234 5678
Other Regions	`+421 [3-5][1-9]X XXXX`	+421 37 654 3210

Mobile Numbers

Slovak mobile numbers start with 9 and are 9 digits long.

Type	Format	Example
Mobile	`+421 9XX XXX XXX`	+421 903 456 789

Regular Expression for Mobile Numbers:

^\+4219\d{8}$

Toll-Free Numbers

Toll-free numbers in Slovakia begin with 800 and are 9 digits long.

Type	Format	Example
Toll-Free	`+421 800 XXX XXX`	+421 800 123 456

Premium Rate Numbers

Premium rate numbers start with 90X and are 9 digits long, often used for services with additional charges.

Type	Format	Example
Premium Rate	`+421 90X XXX XXX`	+421 900 123 456

Shared Cost Numbers

Shared cost numbers start with 85X-89X and are 9 digits long, splitting costs between caller and provider.

Type	Format	Example
Shared Cost	`+421 8[5-9]X XXX XXX`	+421 859 123 456

Dialing Procedures

Domestic Calls

Landline to Landline: Dial area code + subscriber number. E.g., 02 123 4567 for Bratislava.
Landline to Mobile: Dial mobile prefix + subscriber number. E.g., 0903 456 789.
Mobile to Mobile: Dial mobile prefix + subscriber number. E.g., 0903 456 789.

International Calls

Outgoing: Dial 00 + country code + area code (if applicable) + subscriber number. E.g., 00 44 20 7946 0958 for London, UK.
Incoming: Replace leading 0 with +421 when dialing into Slovakia. E.g., +421 2 123 4567.

Number Portability

Slovakia supports mobile number portability (MNP), allowing users to keep their numbers when switching providers. This is regulated by the Regulatory Authority for Electronic Communications and Postal Services (RÚ).

Major Telecom Operators and Number Ranges

Major Telecom Operators

Slovak Telekom
Orange Slovakia
O2 Slovakia
4ka (SWAN Mobile)

Number Ranges

Operator	Mobile Prefixes	Fixed-Line Prefixes
Slovak Telekom	0901, 0902, 0903, 0904	02, 031, 041
Orange Slovakia	0911, 0912, 0915	033, 035, 055
O2 Slovakia	0948, 0949	037, 038, 048
4ka (SWAN Mobile)	0950, 0951	N/A

ITU-T Recommendations/Standards

Slovakia complies with the ITU-T E.164 standard for telephone numbering, allowing a maximum of 15 digits for international numbers, including the country code.

Number Allocation and Management

The Regulatory Authority for Electronic Communications and Postal Services (RÚ) oversees the allocation and management of phone numbers in Slovakia, including number range assignments and portability regulations.

Technical Restrictions and Special Cases

Golden Numbers: Memorable numbers with repeating digits may be sold at a premium.
Number Blocking: Users can block specific numbers through their provider for security or privacy.

Technical Considerations for Developers

When developing systems for Slovak phone numbers, consider:

Validation: Use regex to validate numbers based on provided formats.
Normalization: Remove non-numeric characters (except + in international formats) before processing.
Portability: Ensure systems handle number portability, especially for mobile numbers.
Length Constraints: Enforce strict length constraints based on number type (e.g., 9 digits for mobile).

For the latest telecommunications regulations in Slovakia, visit the Regulatory Authority for Electronic Communications and Postal Services (RÚ).

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