If your current cellular provider costs too much, has poor reception in your area, or doesn't support features you'd like to use, switching to another carrier is the obvious move. But can you bring your current iPhone or Android phone? In most cases, your current smartphone will work just fine on another carrier's network. It's easier to transfer it now than it was when we had to jump through hoops to unlock a carrier-locked cell phone in the U.S. Still, knowing if your phone is unlocked, paid off, and compatible with the network isn't entirely straightforward. To switch carriers, you may... more