With SMS and instant messaging, does anyone still need a walkie talkie? Maybe not. But you\u2019d never know it given Voxer\u2019s popularity. The push-to-talk app is currently among the top free iPhone and Android apps, and its developer, Voxer LLC, says it\u2019s processing more than 1 billion communications every day.\n\tVoxer isn\u2019t the first app to bring push-to-talk messaging to smartphones. For example, HeyTell (also free) by Voxilate for iPhones and Androids certainly has a lot of fans, judging by its user reviews (I haven\u2019t tested the app). But Voxer is the cool newcomer, and it\u2019s worth checking out.\n\tWith Voxer, you can send instant voice messages back and forth to other Voxer users on either platform over Wi-Fi or cellular networks. Voxer also lets you zap a photo or text message to your Voxer buds.\n\tI tested Voxer 2.3.9 for iPhone as well as Voxer 0.9.4 for Android. Except for slight interface differences, the two apps are basically the same. I had a slight preference for the Android version, but only because my Android smartphone screen is one inch larger than my iPhone\u2019s.\n\tNo doubt Voxer\u2019s \u201chey you!\u201d immediacy is appealing to younger demographics, especially given the app\u2019s social network-ish interface. But I can see business types using it, too. Need to grab a colleague\u2019s attention right away? Want to blast out a quick voice message, text, or pic to a group of coworkers? Voxer is your app.\n\tThe push-to-talk capability worked well in my tests, and it\u2019s certainly easy to use: Just keep your finger on the \u2018Hold and Talk\u2019 button while you speak. I doubt anyone would want to carry on a conversation lasting more than a few sentences, however. A standard phone call is much more efficient.\n\tBut sometimes, all I want is a quick verbal exchange--no chit-chat, please. Come to think of it, I guess there is a need for walkie talkies. Over and out.