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How to change back to old iphone 4 SIM card


I changed my sim card over recently to a iphone 5 working sim card, now i want to go back to my iphone 4 and it is not letting me use the old sim card. It says that it is already in use but when inserted in the iphone 4 it does not work

6 replies

Userlevel 5
Hey buddy! You're not doing anything wrong, you actually have the right idea. It's just impossible to use an iPhone 5/5s SIM Card with an iPhone 4/4s. The 5/5s uses a 'Nano SIM' and the 4/4s uses a 'Micro SIM' You'll need an adapter to make it bigger. Most cellular kiosks/stores have them stocked. Aswell as some electronics retailers like Future Shop, Best Buy, The Source, Etc. Hope this Helps!
I have both size sim cards (iphone 4 and 5) i was using my iphone 5 and now i want to go back to my iphone 4 and it wont let my use the sim card number it is saying it is invalid and or already in use but this sim card work yesterday just wont let me change it back is there any way around this problem
Userlevel 5
After a SIM Card has been deactivated it will no longer work. You'll need to buy an adapter or buy a new sim card. Which cost about the same, however, the adapter will allow you to use it back and forth without any effort. Just simply place it in the new device.
Userlevel 3
Justin Robichaud wrote:

After a SIM Card has been deactivated it will no longer work. You'll need to buy an adapter or bu...

Also, if you do want to use only the old micro SIM card, you can give Koodo customer service a call and they will re-activate the old SIM card for you:)
Userlevel 5
Justin Robichaud wrote:

After a SIM Card has been deactivated it will no longer work. You'll need to buy an adapter or bu...

Old deactivated SIM cards cannot be re-activated. Even by calling into customer service.
Userlevel 2
Hey Timothy, If you switched SIMs within the past 90 days, you should be able to switch back via Self Serve if it's done on the same line as before. Could you send us a secured email via this link? http://koodomobile.com/emailen We'll have a look. Thanks ________________________ If you see a good answer, give it a star.

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