It might not all fit anyway, glass protectors are quite thick and if you put one on the back of a phone, it will probably no longer fit properly inside a case.

It was probably a hoax. There’s been a ton of hoax videos on TikTok about “hidden codes” that supposedly “unlocks hidden features” or “lets you know if your phone is hacked” with instructions on entering certain codes into the dialler in order to bring up text that most people don’t understand.

None of these claims are actually true. The codes they tell you to enter are general carrier diagnostic codes and don’t actually do what the TikTok videos claim. They’ll bring up some diagnostic information that the general user won’t understand and the videos trick people into thinking the text means something else.

Should be okay, the adhesive is far stronger than paper. Actually if you kept pushing, the adhesive would have probably broken the paper and not the other way around (but don’t actually do that).

Your phone will be okay. The screen is held down with strong adhesive and two screws at the bottom of the device, a fingernail won’t be anywhere near strong enough to separate the display panel from the body of the device.

I’ve done repairs on these devices before, in order to remove the screen not only do you need to unscrew the two screws at the bottom, but you also need to apply a lot of heat (80°C, 176°F) in order to even loosen the adhesive. Sometimes, even chemical treatment is required.