You need to understand the difference between a network provider and a broadband provider.
A network provider owns and maintains the physical infrastructure (cables, fiber lines, or mobile towers). A broadband provider (or ISP) buys access to this infrastructure to sell internet packages, handle billing, and provide customer support. Many large companies act as both simultaneously.
Think of it like Network Rail owning and maintaining the tracks and Virgin trains, Pennine etc paying NR for the use of their infrastructure.
If you go on a comparison site you will get all the information you need for your area.
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