You could be using a jailbroken iPhone containing malicious software that spies on your every move and you wouldn’t even know it.

It might be unlikely, but it happens, and you should be aware of it — especially if you buy used devices. Fortunately, you can now get a simple app that tells you in an instant whether your iPhone or iPad has been hacked.

Apple’s strict approach to iOS software means that spyware very rarely makes its way onto our iPhones or iPads. But that doesn’t mean we aren’t at risk. A piece of mobile spyware called FinFisher, developed by U.K.-based Gamma Group, is capable of making its way onto your iPhone and recording your every move without you knowing it.

The software can secretly turn on your handset’s microphone to listen to your conversations, it can track your location, and even monitor your emails, text messages, and calls.

Your iPhone could be spying on you, according to the latest trove of documents from Wikileaks, which looks like it could be the biggest scandal yet.

Called the Spyfiles, it’s a trove of documents about the “mass interception industry” — the massive post-9/11 surveillance community that electronically snoops on entire populations.

The industry is selling software to government agencies — some of it delivered by Trojans — that can take over your iPhone. It can track its every use, follow your movements (even in standby), recognize your voice, record conversations, and even capture video and audio from the room it is in.

Thanks to the success of Apple’s iOS devices and its iTunes music store, the company’s iTunes software is installed on more than 250 Million Macs and PCs all over the world, making it one of the most popular media players available. It may not have been so popular, however, had users known it came with a security flaw that allowed government intelligence agencies and the police to monitor them.