@Tesfa80
To unlock sim you need a PUK code https://www.o2.co.uk/help/device-and-sim-support/unblock-your-phone
If you want to unlock to other networks, see this guide Guide: Unlocking an O2 phone to use a different SIM card
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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