Annex VI: DESCRIPTION OF FACILITIES AND SERVICES REFERRED TO IN ARTICLE 88 (CONTROL OF EXPENDITURE), ARTICLE 115 (ADDITIONAL FACILITIES) AND ARTICLE 106 (PROVIDER SWITCHING AND NUMBER PORTABILITY) - Directive (EU) 2018/1972 of the European Parliament and of the Council of 11 December 2018 establishing the European Electronic Communications Code (Recast) (Text with EEA relevance)