Apps have transformed the way we use our phones. They can measure your heart rate, count your steps and even turn your phone into a level or metal detector. (Click here to see a full list of surprising things your smartphone can do.)
But sometimes bad apps slip through the cracks. Typically, apps for Android are often infected with malware - especially those you can download from third-party sites.
Apple apps, on the other hand, aren't usually a problem. Still, Apple has just blocked an app called the Vigilante, not because the app was malicious, but because it presented several security concerns.
The Vigilante app's purpose is to make it easier to report crimes as they happen. The app sends notifications out about crimes shortly after they're reported to authorities.
The intent of the app's developers was to increase transparency and keep people safe by warning them not to wander into areas where there's an issue. But Apple is worried that the opposite effect will actually happen. By sparking the curiosity of people in nearby areas, those individuals may choose to investigate the crime, or even try to help in some way.
Of course, this is a bad idea and could be extremely dangerous.
Developers of the app have released an official statement on their website. It says the following:
"Unfortunately, Vigilante is not currently available on the App Store. We are working with Apple to resolve their concerns. In the meantime, the Vigilante app will continue to operate for those who already have it.
"We’ve already been hard at work bringing Vigilante to Android and we will be releasing an Android app imminently.
"Over the last 48 hours, we’ve received an incredible outpouring of support from all over the world. Please share your email so we can get in touch as soon as we have updates."
Even if you don't have this app on your phone, it's important that you check with your kids and grandkids to see if they've installed it. Warn them of the risks of using this app, and make sure they're using it to avoid dangerous areas, rather than investigate them.