Foldable phones are selling like hot cakes outside the U.S. but I don't know about the U.S. market. Could be catching up.

   Here are some things to know about folding phones

   1. They're like expensive cars. Do not own one without a warranty
   2. As soon as the new model comes out, swap it in
   3. If you're into smaller phones, they're a good option
   4. They are not for the financially conscious. Those things are kind of a status symbol