GNP is the ability for customers to transfer their geographic telephone numbers between Network Operators when they switch from one fixed line Network Operator to another.
Geographic telephone numbers are also known as landline or fixed numbers. This refers to the numbers 01x, 02x, 03x, 04x, 05x
This excludes 0860, 0800, 0861, 087, 085, service provider specific numbers (e.g. 1023, etc) and mobile numbers.