Auto-connect to wifi and Auto-vibrate mode
I'm using a Samsung Android phone, just an ordinary phone and it's quite old, but still usable. I'm not sure if my phone has a virus or what but recently there are times that my phone will automatically connect to wifi (even if I'm not in a wifi zone) and the Sound Setting switches to Vibrate "Only when not in Silent mode" even if I'm not doing anything at all. These will not happen individually but they happen at same time. I cannot trace if I downloaded an App that caused this. I hope you can help me. I'm trying to look for antivirus but it cannot really do anything. I even plugged it in my computer and scanned my device but there's zero progress.
Thanks in advance!!