How much data do you have?
Basic things to do are use wifi as much as possible and turn off mobile data when not in use.
Also to note, o2 won't charge you for exceeding data if you are on a monthly contract, they will just stop your data until the next month.
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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