If you don't want to use them and there is a disable option, just press it - It won't do any harm.
Disabling background data will stop emails and updates to social media from coming in automatically. It may also stop whatsapp messages and the like.....
What is it you are trying to achieve?
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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