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[Brad03]

It won’t let me log into my O2 account on the app. All of my credentials are correct - I’ve double and triple checked this just to be sure. 

[Bambino · Accepted solution]

@Brad03 This is not O2. This is a customer community. You'll need to speak to customer service in the morning to access your account.
Call 202 from your mobile or 0344 809 0202 or 0800 032 1402 from any phone or numbers here: Guide: Coronavirus Community Help and Support 
When it comes to the reason you are calling, stay silent for 15 seconds and you will be taken to the keypad options.
Press 2 for Everything Else
Press 5 for More Options
Press 7 for Anything Else which will put you though to someone.
Say 'Upgrade', 'Lost/Stolen', or 'Fraud' if the suggestion above doesn't get you through.
Best time to call is 8 am.
You can also reach O2 via social media:
Facebook (https://o2uk.co/O2CFB), Twitter (https://o2uk.co/O2CTW), or Instagram (https://o2uk.co/O2CIG)
Or you can call them on 0800 081 0255