Whether you missclicked or downloaded the wrong file, malware can infect your Android device or iPhone and you might not have even noticed. There are some signs that are completely obvious, but others are a little more discreet and take some snooping around to suss out.

Here are some warning signs that you might have an unwanted guest on your smartphone.

Advertisements spamming your phone, especially outside of an app, is a dead giveaway. Don’t ignore the problem, even if you’re a fan of Neon Genesis Evangelion who really appreciates seeing “CONGRATULATIONS” spread across their screen.

If your phone is packing a ridiculous number of applications like mine, then you might not notice when a new app creeps into your system. For both the sake of spotting malware and cleaning up your library of unused apps, it's worth taking the time to audit your current apps.

Malware does a lot in the background to wreak havoc on your device, and that takes power. So one of the telltale signs of malware infecting your device is if you experience shorter battery life. Battery life can vary, especially as a phone ages, so I recommend looking up the average battery life for your device to see if there's an obvious discrepancy.

Got a brand new phone and all of a sudden everything slows down to a crawl? Are apps randomly crashing on you? This is another sign that malware may have crept onto your device. This may be more difficult to spot on phones already experiencing slower performance, so keep an eye out for other signs if that’s the case.

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