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For your peace of mind, we recommend that you run your existing broadband service in parallel with our service for between a week and month before cancelling the contract with your current ISP. You need to take account of the length of notice that you have to give in order to cancel your existing service.
This means that you have service from two internet service providers at the same time, for a small period of time. The upside is that you know if one service fails, the other will work. The downside is that you are paying for two services at the same time.