Why is my IPhone not working? - 1

Hi, so I have an IPhone 4s and a few weeks ago I dropped it on the pavement and the screen cracked. It still worked perfectly fine but I didn't like how the crack looked on the screen so just 3 days ago I gave my phone to this phone store and they fixed the screen so I picked it up 2 days later.
When I was using it, every minute the screen would sort of freeze/pixelate then just restart when it was plugged into the charger. It happened around 12 times so I took the charger out and it didn't go off however my battery was at 5% so I really needed to charge it for an event.
Just yesterday I was using it and my phone just turned off and i have tried everything to get it back on. My sim card slot is also jammed but comes out when you really force it.
Is there anything I can do to get it back on? Also, what would happen if I take the battery out then put it in again? I don't want any of my content to be deleted because it is very important to me.

Going to have this checked by the guy who fixed it. It won't turn on at all.

Cars & Transportation > Maintenance & Repairs

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