One potentially big caveat: Your current iPhone needs to be unlocked from any carrier. If you have an iPhone that's on a payment plan from Verizon or AT&T, you may not be able to try this out until ...
Every smartphone is either locked or unlocked, depending on where you buy the device from. When you acquire a new mobile phone directly from a U.S. carrier like AT&T or Verizon, it will be locked to ...