my iphone 5 broke, how do I go back to using my iphone 4 b/c it does not take a SIM Card

[iMore Question]

I broke my iphone 5 so I need to temporarily go back to using my iphone 4 but I can't put my SIM Card in it b/c 4's do not use SIM Cards, so how do I go back to my 4?

 

[SwitchBeach]

What carrier are you with?
If you are with a CDMA carrier you will need to activate the device on your account. You can typically do this via the carrier's website or via their customer service phone number.