Will you lose internet connection during the switch?

In most cases, you will be able to switch with little or no service interruption (a couple of hours at the most). Your new provider should let you know when the switch is going to happen and if you’re likely to experience any loss of service.

If you are moving to a provider who is not on the Openreach network, then you can schedule the contract end date with your current provider to ensure that you have no downtime between suppliers.