Switching to using the hub for the phone line will not affect switching to another provider. You would still have a physical line it is just the way the phone line is provided, all providers are switching away from the old style of cabling by the end of 2025, basically it means that you phone line will be provided by the internet connection, there is one disadvantage to the new system in that if your broadband is down or your hub is off then there is no phone line.
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