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O2 keep sending verification codes to original sim card phone number but I kept my old number

Elsart
Level 1: Joiner
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I've been on live chat but they couldn't understand my query. I changed to my old number several months ago. No problems at all except when try to get on my02

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MI5
Level 94: Supreme
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@Elsart 

This is a customer to customer community, not O2, so we cannot access your account, sorry.
You need to contact O2.
Message them on Social Media. Facebook (https://o2uk.co/O2CFB) , Twitter (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG) or give them a call on 202 or 0344 809 0202 (contract) 4445 or 0344 8090222 (PAYG)

Try online https://mymobile.o2.co.uk/ as the app can be flaky and sometimes needs to be deleted and reinstalled.

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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