So this might sound a bit silly but I completely forgot that I'm still paying for this O2 contract, I haven't used it in at least a year, I don't have the sim card or phone anymore, I still have access to the online account but I'm unsure how to cancel without being able to ring o2 from the phone/sim.
I already have another contract with another provider so I'm not looking at switching to a new tarrif, just a straight cancelation.
The old cancellation method would be your best bet https://community.o2.co.uk/t5/How-to-Guides/Cancelling-Your-Contract-A-Guide/ba-p/566774#M56526
New process here for comparison Guide: Cancelling Your Contract
or just contact O2 customer service Guide: How to find help & contact O2
You shouldn't have any issues cancelling if you follow the great advice posted above @Will102 but if you do need some further help don't hesitate to let us know.
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