Check in Settings >More >Networks >Access point names (apn's) and make sure you have an active O2 connection. (you might need to click on it to activate and make sure you press save or done afterwards.
Also ensure that the option to "use Mobile data traffic" is ticked.
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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