Consult:
- Sistemas de Telecomunicações Móveis Internacionais (UMTS) https://www.anacom.pt/render.jsp?categoryId=282895
By determination of 4 February 2009, ANACOM decided to revoke the right of Sonaecom to use the block of 5 MHz TDD UMTS frequencies corresponding to 1900-1905 MHz frequencies, which were allocated to the company for the operation of the UMTS system, and further to proceed with the respective recovery. The action is taken following SONAECOM's submission to renounce said rights.