how do i change iphones but keep same number?

No. You will need to talk to Verizon to switch the service from the iPhone 5 to the iPhone 4. Since they are a CDMA carrier, they will need to activate the service on the iPhone 4. Note that if it is not a Verizon iPhone 4, you can't use it on Verizon.

jeffegan22 wrote:

my iphone5 is going crazy, and I have a spare iphone4. can I change my number from one phone to another with out going to Verizon or apple store?

Thank you

You should be able to switch your number to another phone by logging in to your Verizon account online and finding the "Activate Device" option.