Now, there's a new ransomware going around that targets Android gadgets. Right now, "Koler" is looking for devices to infect, and it follows a familiar script.
It's known as a "policeware" or "police locker," and it takes over your Android and warns that you're under surveillance by federal agents. It says you're suspected of criminal activity - viewing illegal pornography, in this case. It demands a ransom of $300, paid via MoneyPak, to unlock your phone.
The malware doesn't get on your Android out of the blue. You have to enable it, by being fooled into installing a special "video player" app. The app isn't in Google Play Store, so you're safe if you don't have "Allow installation of apps from unknown sources" enabled in your security settings.
If you do get Koler, there are a couple of ways to get rid of it. The easy one is by doing a factory reset on your device. You'll be cleaned, but you'll lose all your installed apps and stored data.
The better solution is the more difficult one, which is to boot up in Android "Safe Mode" and clean out the virus there. Find out how to get into Android "Safe Mode" here.
When you're in Safe Mode, go to Settings>>Apps and then look for that new app you installed. That's the one that gave you the malware. Delete it from there. Then you can reboot.
You really should have protection for your Android device before you do anything else. Go here to get powerful protection for your smartphone.