This should help explain what you need to do:
https://www.sky.com/help/articles/switching-to-sky-mobile-keep-your-number
Buy the Sky sims so 4 of them in your case
Activate them when they arrive but do not put them in the phones
Get pac code from your current supplier
Give Pac codes to Sky
When your current sims stops working insert your Sky sims in the phones.
You can give Sky your pac code online here:
https://www.sky.com/myaccount/mobile/sim/x/my-number/transfer
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