My phone won’t connect to the network
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@91 Your best option is to contact O2 via social media to get your issue resolved:
Facebook (https://o2uk.co/O2CFB) , Twitter (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG)
I DO NOT WORK FOR O2
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Also check these links
Guide: Is the network down for me or everyone?
Guide: How can I sort out my network issues?