You may have seen the signs when going through US Customs: No Cell Phones or Cameras May Be Used.
They mean it. No matter how much you want to talk to your mother or husband or home-alone cat…don’t do it. Customs does have the right to confiscate your phone and not return it. Seriously.
Same goes for cameras. I know you’re tempted to take an Instagram of the long lines. Don’t do that either. All cameras are forbidden.
They mean it.