I recently got a sim and I couldn't activate it so I just left it. But then O2 charged me 195.47 and the contract was was cancelled. I want to know how I can activate it.
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you should contact customer service and actually speak with someone about this.
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If you message O2 on Facebook (https://o2uk.co/O2CFB) , Twitter (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG) , they should be able to help you with this.