Simply serve your 30 day notice to cancel O2 SIM Only tariffs are subject to status, credit-check, and payment by direct debit. You may give O2 written notice that you wish to end your contract or change tariff at any time, and this will be effective 30 days after O2 receive your notice. You will be required to pay the applicable monthly charge for your SIM only tariff until the end of this 30 day notice period.

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