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Yesterday I took my new phone to a mobile service shop... I wanted them to put a protection layer on my display. I have a pattern lock on my phone so I just put the display to sleep and gave it to him. He went to another room, and 15 minutes later he gave me the phone back.

My questions are: even though I have a pattern to unlock phone how can I make sure that he did not do anything suspicious to it? He was very strange. Could he have guessed or cracked the code? Is there a way to inject some kind of harmful code via usb cable? How can I check all the activity, not just browser history or history.google.com but all the list of apps that were turned on? Or any other activity that might cause problems to me. Also, is there also anyway to inject some kind of harmfull code to a blocked phone using usb cable? And lets say that code would delete the pattern and gain the access to phone ?

I want to hear from a security expert. Should I do a factory reset would it delete everything that might be inserted by him to the phone ? just to make sure?

Or am I being paranoid? Thanks

  • What Android version are you running? – Aaron Gillion Jun 23 '16 at 19:35
  • 6.0 Marshamllow , – Tomas Jun 23 '16 at 19:38
  • Possible duplicate of How do I know when an app was used in Android? – beeshyams Jun 23 '16 at 19:43
  • no its not duplicate beeshy i dont talk just about app usage at all. – Tomas Jun 23 '16 at 19:46
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    Go thorough the answers. Your question talks of how do I check app activity, list of apps turned on and that is what is answered in the possibly duplicate question. And yes another thing, this site works best with a single Q and A format – beeshyams Jun 23 '16 at 19:51

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