When I updated my phone I was given a 5G sim but since putting it in my new phone I cannot receive an O2 signal. Are they time limited?
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Put your old sim in the new phone, or if you're in a 5G enabled area do a swap if a sim was sent with the new phone if you want to avail yourself of 5G.
SIM Swap: a mini guide (incl eSim) - O2 Community
I DO NOT WORK FOR O2
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