Number block portability meaning

number block portability describes the transfer of a contiguous series of telephone numbers (for example, a DDI range) from one communications provider to another while the customer keeps those numbers. It is typically used by business customers to move multiple geographic or non‑geographic numbers, and operates as a form of bulk porting within the wider number portability regime. The expression is descriptive rather than a term defined in primary legislation. In the UK, Ofcom’s General Conditions (notably GC C7 under the Communications Act 2003) require providers to facilitate number portability and underpin industry processes that enable block or bulk ports. In Ireland, equivalent obligations arise under the European Electronic Communications Code as implemented by ComReg through numbering conditions and porting decisions. Key legal features include: donor and recipient provider obligations to process ports without undue delay, limited and cost‑oriented porting charges, exchange of accurate routing/porting data, and continuity of service. Roles such as range holder, donor provider and recipient provider, and the technical routing arrangements, are set out in regulator guidance and industry porting codes and reflected in interconnect and wholesale contracts. Usage and outcomes are broadly consistent across England & Wales, Scotland, Northern Ireland and Ireland, though detailed procedures and timescales...