Cancelling account without a SIM

[CMC_R]

Hi all, I signed up for a Virgin Media boardband + O2 mobile bundle a while ago. I have terminated the VM part since I moved last year but I've kept on paying O2 even though I've never used it (I've been using another provider since before signing the bundle.) Now that the 18-month O2 contract is coming to an end (Jan 2025) I was wondering how do I cancel the plan? I have not used the O2 SIM for a second and I don't think I've ever seen the actual SIM card. Should I report lost SIM first? Can anyone help me out?

[MI5]

@CMC_R 

You can report lost and get a replacement sim.

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

Then cancel this way.

Guide: Cancelling Your Contract 

Or without a sim.

https://community.o2.co.uk/t5/How-to-Guides/Cancelling-Your-Contract-A-Guide/ba-p/566774

[CMC_R]

Thanks so much MI5, I'll try the recorded letter method. Just to followup, will I receive a reply or something to know that they have acted on my request?

[MI5]

@CMC_R 

Probably not, but your sim will switch off and you'll lose access to your MyO2 when cancelled