Greetings! I recently found a lost phone on a road side and it was off I didn't want to pick it but, since I thought somebody else would and they may just sell it or whatever so I picked and the device is (A31) and has a sim but it is locked so I can...

My Samsung A71 is making Strange unusual buzz sounds like something insides moves, Whenever I press the home button or mute the notifications/volume or receive any notification can anyone guide me what is the issue in ?