@mkhsentariq
Pay monthly sims should be activated already
Activating your sim
New Pay Monthly customers
If you’re using a plastic sim, your sim is ready to use straightaway. Just pop it in your device and you're good to go. If you’re using an eSIM, you’ll just need to download the eSIM profile to your device, using the QR code in your eSIM pack.
https://www.o2.co.uk/help/device-and-sim-support/activating-your-sim
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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