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New phone not connecting to network

Pinky
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I upgraded my phone yesterday (iphone12pro). I inserted new sim which has still not registered to network. Any suggestions?
I am still using my old sim on old phone u til new one up and running. Is this problem?
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MI5
Level 94: Supreme
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@Pinky 

You can use the old SIM in your new phone or if you want 5g you need to 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.

Currently using:
Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)

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MI5
Level 94: Supreme
  • 143452 Posts
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Registered:

@Pinky 

You can use the old SIM in your new phone or if you want 5g you need to 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.

Currently using:
Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)
Message 2 of 4
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Pinky
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Many thanks - this has worked. Appreciate your help
Merry Christmas 🎄 🎅🏻
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MI5
Level 94: Supreme
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You're 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.

Currently using:
Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)
Message 4 of 4
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