If you are referring to data roaming (?) it only has an effect when connecting to non UK networks, so won't make any difference in the vast majority of the UK.
If you just mean data you can turn this off to save the £1 a day web daily charge (if no data allowance) but you won't be able to send and receive MMS messages with it off.
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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