Any contracts taken after 1st October 2018 can have a spend cap applied.
If your contract was taken prior to that point, you must wait until you upgrade, change or renew your contract.
O2 have some excellent help here so I won't repeat it, but some points to note:
Any chargeable usage outside your monthly allowance or outside of any Bolt On allowance, such as:
For information relating to business customers, see here
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