@Adria
Buy the Sky sim
Activate the sim when it arrives but do not put it in your phone, so keep your current sim in it.
Get pac code from your current supplier
Give Pac code to Sky
When your current sim stops working insert your Sky sim in the phone.
You can give Sky your pac code online here:
https://www.sky.com/myaccount/mobile/sim/x/my-number/transfer
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