Transferring number within the same network

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So I assume the method of doing this is still to port the number outside of the network first and then back in?

If so, is there a preferred sim that I should use to do the process? Are any networks quicker at getting this done than others?

I'm currently with EE and just got a new EE contract through a third party seller.

Thanks!!

 

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Thanks everyone, just requested my PAC code and will get a PAYG sim today to continue the process.