Apologies if sounds stupid but I am on BT mobile for 3 sims, all happy and good. Getting my wife a new phone (unlocked) for her birthday, I take it you don't have to re register etc, just pop the sim from the old phone in the new one ?
Thanks in advance
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If the phone is unlocked to any network, just pop the sim in and you're ready to go.
I'd advise checking the sim size though, if the existing handset takes a different size sim, you might need to order a free replacement small should be ok as BT have sent universal sims for years, you could push out the smaller size.