@0218
How to here https://www.o2.co.uk/help/device-and-sim-support/how-to-keep-your-mobile-number
or if you are just replacing an existing O2 sim, you need to do a sim swap Guide: Sim Swap: a mini guide 2017 update
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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