Terminating O2 contract

[SK2021]

I had purchased an Apple Ipad Pro 12.9 on contract from O2. The contract was for 3 years and is finishing end of next month. Along with my device plan I have been paying monthly for my data charges which I have never used much as I am mostly on my home wifi network. 
my question is that after my last device installment is taken by O2 next month, how should I cancell the data plan because its of no use to me and i dont want that I be charged after next month for something which i never used. What would be the procedure

thanks

[MI5 · Accepted solution]

@SK2021 

How to cancel here Guide: Cancelling Your Contract 

Or call O2’s customer service team about – give them a call on 202  or 0344 809 0202

[SK2021]

Thanks for the reply MI5

but the issue is that the sim came installed in Ipad Pro and simce its an ipad pro, there is no way I can send text messages from it. Its has been used only for productivity purposes. I have gone through the cancellation guide link provided by you, and it says to text for STAC code, but my sim is preinstalled in the ipad and I am sure its data sim, so how can I get STAC code in such a situation

thanks

[MI5]

@SK2021 

I assume you mean an eSim as you could remove a physical sim and put it in a phone to text from.

Otherwise, use the number to call them.

Now is a good time to call.