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Obtaining a PAC Code from your existing provider is done before you leave them. It is valid for 30 days. When you actually end your existing contract should determine what you losing provider can charge you for. As it says in the OFCOM advice if you are still contracted to your existing provider you may be liable for charges. I reckon your existing provider may be able to be more specific for you as to what they can charge for your final bill depending on the day you actually end the contract with them - not necessarily the day the PAC Code is used by your new provider to get your number onto the new service