Your smartphone is like your minicomputer that can be fit in your pocket. So, like your PC or laptop, it is also unsafe to Malware, which can turn into the form of adware, spyware, and ransomware. Unfortunately, sometimes it can be tough to recognize whether your device has been infected or not.
Source :-https://kellieminton123.wixsite.com/mysite/post/signs-your-smartphone-might-has-a-virus-and-how-to-remove-it