I did not use my sim on this account and have thrown it out so can't get in to my account as I don'

[19567]

I didn't use my sim and must have thrown it out and know I can't get in to my account as it's asking for my telephone number and I don't know it.

[MI5]

@19567 

You need to report it lost and O2 will send a new one.

Guide: Lost or Stolen O2 Device? - How to Report it 

Guide: How to find help & contact O2 

[jonsie]

It will be difficult to report it lost if you don't know the number or any account details

Best option is to speak to customer service to see if they can trace the account and issue a new sim card

Presumably you never registered for My O2

Difficult times ahead unless you have the original contract emails

[Oxonian]

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@19567 wrote:

I didn't use my sim and must have thrown it out and know I can't get in to my account as it's asking for my telephone number and I don't know it.

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What has prompted you @19567 to ask that question ? 

Have you received a communication from O2, maybe a bill or a letter chasing payment ? 

Does whatever you have received give any clues such as a telephone number or an account number ?