This guide outlines the supported number types, required documents, hosting rules, and porting timelines for Czech numbers.

Supported Number Types

Number Type	Format Example
Geographic (Local)	e.g., +420 2xx, +420 5xx
National	e.g., +420 8xx
Toll-Free	e.g., +420800xxx xxx

⚠️ Mobile numbers (+420 6 or 7xxx ) are not portable to VoIP operators and are not able to be set-up as Virtual Caller IDs due to firewalls from the Czech Mobile Operators

Ready to Port?
You can submit your request to our porting team using our International Porting Form.

If you have numbers from other countries, check Global Porting coverage for details.

Required Documents For Number Porting

For all number types (local, national, toll-free) in the Czech Republic:

Signed Letter of Authorization (LOA)
- Will be provided over email after submitting your request. You can proceed with the International Porting Form without attaching LOA
OKU Code from Your Current Provider
- Mandatory for number porting in Czechia
- Must be requested directly by the end user from their current (losing) provider
- Without this code, the porting request will be rejected
Recent invoice from the current provider

What is the OKU Code?

OKU (in Czech: Ověřovací Kód Účastníka) is a unique porting authorization code used in the Czech Republic to confirm the end user's consent for number transfer.

It is assigned by the current (losing) provider to the number holder
Functions similarly to a PAC or PIN code in other countries
It confirms ownership and authorization for the number to be ported

You must request the OKU code from your current provider before submitting the porting request to CloudTalk.

Number Porting Process & Details

Number Type	Estimated Duration	Price
Local	~8 business days	€30.00 per request, €25.00 per number
National	~8 business days	€30.00 per request, €25.00 per number
Toll-Free	~8 business days	€30.00 per request, €25.00 per number

Porting Process Overview

Submit Your Porting Request
Send your request to the CloudTalk Porting Team to begin the process.
Initial Review
Cloudtalk team'll verify number portability and confirm the next steps.
Documentation Collection
Complete and sign the LOA (Letter of Authorization), and provide a recent invoice from your current telecom provider.
Submission to Carrier
CloudTalk submits your request to our partner carrier, who then forwards it to your current provider.
Approval or Rejection
- If approved, Cloudtalk team will confirm the porting date (typically 2–4 business days in advance).
- If rejected, Cloudtalk team will share the reason and guide you on how to correct and resubmit the request.

Common Rejection Reasons

Contact your current service provider before submitting a porting request to CloudTalk. They can advise you on all information regarding your numbers

Read the section "What Should You Verify With Your Current Provider?" in CloudTalk Recommendations for a Smooth Port to know what to check with them in advance.

Issue	Explanation	How to Fix
Missing OKU Code	Porting request cannot be validated without it	Request your OKU from your current provider before submitting
Mismatched Provider Info	Incorrect formatting of number or details	Double-check the number’s type (local/national) and format
Number Inactive	Number is suspended or deactivated	Contact your provider to reactivate the number first