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Can't use phone as message 'not registered on network'

MartinJ
Level 1: Joiner
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Please help me, as my phone will not make or receive calls or messages?

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MI5
Level 94: Supreme
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@MartinJ 

Check guide to see if you can find the cause Guide: Is the network down for me or everyone? 

Sometimes, just removing and reinserting sim or rebooting phone will fix it.

I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
Please select the post that helped you best and mark as the solution. This helps other members in resolving their issues faster. Thank you.
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