PHILADELPHIA — Imagine a walkie-talkie whose range is so wide it reaches halfway around the world. Seem far-fetched? That’s what a new software program for cell phones promises — and, for the most ...

Walkie-talkies have been around since World War II, but the old-style technology finds its uses in the hospitality industry. Basically low-wattage two-way radios, these tools allow workers to keep up ...

A family friend gave his six-year-old twins two of the push-to-talk devices last year, for a way to talk to each other from different parts of the house. Now that the house is also an office, school ...