@sangha
Depends on type of sim.
https://www.o2.co.uk/help/device-and-sim-support/activating-your-sim
PAYG needs to be topped up Guide How to Top Up (PAYG)
For further help, contact O2 Guide: How to find help & contact O2
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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