Currently my husband wants my Motorola Droid Razor since he can't stand his iPhone anymore. I was wondering if I could transfer my phone to his iPhone and move his phone number to my Razor. Does it cost anything?
You can do this, and there is no charge to swap devices. Since both lines are active, you should go to a store and have the rep there do the swap. Keep in mind that the iPhone has a different voicemail system so neither one of you will have access to any existing voicemail messages on your current number once the swap is complete.