S20 FE Erase the New Sim Card Phone Number Replacing It With My Old Phone Number

[Georgia-Maia]

I upgraded and got a new S20 FE mobile phone and I also changed the mobile company I'd been with because of a better deal. I've kept my old mobile number, but the problem I have is the new sim card has a new mobile number on it. When you look in the information about the S20 FE, the new sim card mobile number shows up and not the old number that I wanted to keep. Is there a way I can adjust it so it shows my old mobile number instead? Can anyone
help, many thanks in advance for your help.
Georgia Maia 

[NHPIXELSPHOTOGRAPHY]

Hi there can you give a bit more detail is it the old phone number is showing up on the home screen or lock screen?

[Slothtamerv2]

If you got your number transfered over it should be active, ask your current network if they received your old number if not then ask them to request it

[DaveNewco]

You will need to get your network to send out a new SIM that is only registered with that number. Because the new SIM had a different number assigned to it in the first place it will always show that on your device. + could need to reset phone aft new card received to finally sort it to either show original number you keeping or will show as no number at all.