@Emmafagan82
Yes, you automatically keep the same number when you upgrade and can use your current sim, although you may wish to sim swap to the new 5g sim that comes with your upgrade Guide: Sim Swap: a mini guide 2017 update
All O2 phones are now unlocked to allow any network 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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