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iPhone 12 Pro Max - No Service

iPhone2021
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I have just upgraded my iPhone XR to an iPhone 12 Pro Max, this came with a new SIM card, I have followed the instructions to update the sim by texting 20220.

 

My old SIM then stopped working, my new Sim started working in my iPhone 12 pro Max, after an hour it has stopped working, my iPhone connects to Wifi but does not allow me to open anything online (Safari or apps)

 

i put the new updated SIM into my iPhone XR and this works fine so it's not a SIM card issue.

 

any ideas?

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MI5
Level 94: Supreme
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@iPhone2021 

Some iPhones are shipped with a temp bar on them to deter theft.

Call O2 to have it removed Guide: Coronavirus Community Help and Support 

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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iPhone2021
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Thanks.

 

I sort of got it working.

 

I removed the SIM, added my old one then re insert my new one.

 

it has been working for about 2 hours, now saying 4G and can connect to the WIFI but acts as if it's on airplane mode, by this I mean it can not load any new web pages or online apps. I will call O2 about the network.

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