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Do I have to swap sim with an iPhone to iPhone upgrade

Slb81
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I have an iPhone XR I’ve upgraded to an iPhone 12 and I want to know if I have to use the sim sent or can just move my current sim
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jonsie
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You can use your present sim

but

if you are in a 5G area then follow this guide to use the new sim

Guide: Sim Swap: a mini guide 2017 update 

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jonsie
Level 94: Supreme
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You can use your present sim

but

if you are in a 5G area then follow this guide to use the new sim

Guide: Sim Swap: a mini guide 2017 update 

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MI5
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@Slb81 

If you want 5g, do a sim swap to use the new sim Guide: Sim Swap: a mini guide 2017 update 

If not, just use your old one.

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:
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
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