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You can do it any time. You give notice to cancel your contract which means you will pay the remainder off
Then go for the sim only contract. If you have any problems you will need to speak to customer services Which may be best as you can explain exactly what you want to do. Best time to call is between 8-8.30am
*The Game Is On*
Track usage, upgrade and get support with the My O2 appDownload My O2