This guide outlines the supported number types, required documents, hosting rules, and porting timelines for Czech numbers.
Initial Overview
1. 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.
2. Submit Your Request
Request porting directly in the CloudTalk Dashboard: open Numbers > Port existing number and follow the guided steps. All supported number types for this country use the same flow, and you can track your request anytime under Numbers > Porting requests.
Looking to port numbers from other countries? See Global Porting Coverage.
3. Letter of Authorization
You’ll need to submit a signed Letter of Authorization (LOA). If a template is available for this country, it downloads inside the Documents step of your porting request; otherwise we’ll email you the correct template after you submit. Sign it and upload it with your request.
(Other document requirements listed below.)
4. Timelines & Pricing
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 |
⚠️ Timelines may vary if submitted details do not match your current provider’s records.
Required Documents For Number Porting
Signed LOA
OKU Code (mandatory; request directly from your current provider before submitting the porting request)
Recent invoice (from your 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.
You’ll enter your OKU code in the Verification step of your porting request.
Porting Process Overview
Submit Your Porting Request
Submit your request in the CloudTalk Dashboard under Numbers > Port existing number.
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
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 |
On Porting Day
The number is activated in your CloudTalk account
Your former provider deactivates the number
CloudTalk billing begins the same day
We recommend notifying your previous provider to prevent duplicate charges
Need Help?
For further assistance, please refer to:
Porting Pricing and Coverage - all countries where we offer porting
Country Specific Porting Guides - for our most requested countries
Questions about a request you've already submitted? Open it under Numbers > Porting requests and click Open conversation. You can also reach our Porting team by email. We're always happy to help!