Dropped phone, screen not working properly.

(Thread moved, because i'm honestly a noob at forums)

Before you burn me at the stake, I know the title is vague, but I do have a few questions I need answered if possible.

First things first, I have an Alcatel Pop One Touch C7. You're probably not familiar with the phone but I don't think it actually matters in this case.
Now, I dropped my phone a couple of weeks ago, and while the screen didn't crack, it is definitely not working properly. What I think happened is that the cable connecting the display to the phone is slightly dislodged. The screen shows washed up colors and seems to lag when trying to display a new "frame", for example when I type in something and the screen slowly fades in said something. I'll post pictures as soon as I can.
I tried opening the phone, but when I unscrewed the back, I saw this sticker going from the battery slot all the way to the board.
I watched a few videos showing how to "unstick" the sticker, but I don't have a heatgun or tool that can help me do so.

My question is:
Do you think this sticker is important to the phone, or can I just rip it out or cut it?

Thanks in advance