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Changing a phone number on a 4s when one has bought a mini 12

I bought a mini 12 and successfully used the SIM card from my old 4s and replaced it with a new SIM card. Now I want to replace that new SIM card in the 4s with a different SIM card and I can't change the number on both the mini 12 and the 4s

Can anyone help please?

iPhone 4s, iOS 9

Posted on Dec 25, 2021 3:51 PM

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Posted on Dec 25, 2021 10:01 PM

SIM can be changed only if the iPhones are Unlocked and SIM Free.


Carrier Lock:- Request your iPhone’s original Carrier to unlock your iPhone and if they agree and do it, then you may know the further process here --> How to unlock your iPhone for use with a different carrier ...

2 replies

Dec 25, 2021 10:02 PM in response to froglind

If you see No Service or Searching on your iPhone or iPad

  1. Check your coverage area. Make sure that you're in an area with cellular network coverage. ... 
  2. Restart your iPhone or iPad. Restart your device. ... 
  3. Check for a Carrier Settings update. ... 
  4. Take out the SIM card. ... 
  5. Reset your Network Settings. ... 
  6. Update your iPhone or iPad. ... 
  7. Contact your carrier. ... 
  8. Get more help.


If you see No Service or Searching on your iPhone or iPad ...



Remove your SIM card from the SIM card tray and then put the SIM card back. ... Make sure that the SIM tray closes completely and isn't loose. If you use a SIM tray from a different model iPhone, iPad, or from another phone manufacturer, it might not fit properly.


If you see 'invalid SIM' or 'no SIM' on your iPhone or iPad ...



Learn what to do if you see a SIM not supported alert.

Changing a phone number on a 4s when one has bought a mini 12

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