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No network connection on new phone/sim

Bob06
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I have just upgraded my sons phone lPhone xs to iPhone 12 Pro keeping the same number. He has transferred all his data from the xs but he has no network services on the new 5G sim that came with the phone. I thought his number would be automatically be transferred to the new sim. Am I missing something that needs to be done to activate it ?
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MI5
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@Bob06 

Use the old sim unless you are in a 5g area.

If so, do a sim swap Guide: Sim Swap: a mini guide 2017 update 

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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MI5
Level 94: Supreme
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Registered:

@Bob06 

Use the old sim unless you are in a 5g area.

If so, do a sim swap Guide: Sim Swap: a mini guide 2017 update 

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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Bob06
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Thanks
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MI5
Level 94: Supreme
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Welcome
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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