PORTING INFORMATION
Voice services
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Voice services
To help keep things consistent when your switching to our services, number portability is available for both retail and wholesale services. If you wish to keep your existing numbers when using our Voice, VoIP or IN Services, you must follow the instructions listed below to bring these numbers over to the Colt network.
On this page, you will find all the information you need to do this, alongside country-specific information and other helpful resources.
Who to contact in the event of any issues affecting your service, sorted by country.
Our information matrix for all types of ports available with us.
Porting agreements that we have in place with carriers across Europe.
July 30, 2026
Porting Matrix Updates LOA updates for PL and CZ
The Porting Matrix has been updated with the following changes: updated lead time for surrendering carriers to accept porting in CZ (for GSIP and IN), and added additional documents required for Greece porting (for GSIP). Updated LOAs have been uploaded for CZ and PL
May 6, 2026
Porting Matrix
The Porting Matrix has been updated with the following changes: updated rejections reasons for CZ port out (GSIP + IN), updated port out details for Singapore (GSIP), and updated port details for South Korea (GSIP)
February 26, 2026
Porting Matrix Updates
The Porting Matrix has been updated with the following changes: (1)Additional information has been added for South Korea (Global Geo)
January 6, 2026
Migration to new docs site
All porting information has now been migrated to the new Docs platform. Please use the feedback tools on this site to provide your feedback.
September 5, 2025
Global porting forms
(1) The Romanian LOA has now been added into the Global IN section. (2) An additional porting form for Bulgaria has been uploaded.
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