The Procedures and Principles Regarding the Amendment of the Procedures and Principles Related to the Number Portability Implementation Process have been approved by the Board Decision dated 22.12.2021 and numbered 2021/DK-YED/402. The final version of the Procedures and Principles can be accessed via the link https://www.btk.gov.tr/uploads/communiques/nt-uygulama-surecine-iliskin-usul-ve-esaslar-ocak-2022.pdf.