If you press and hold the power button for 1 sec it will bring up a menu to turn data on or off. It will also be in settings >more >mobile networks. Check you have a green dot next to the O2 APN in access point names, also.
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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