Opening the iPhone's display will compromise its waterproof seals. Have replacement seals ready before you proceed past this step, or take care to avoid liquid exposure if you reassemble your iPhone without replacing the seals.

Heating the bottom edge of the iPhone helps soften the adhesive securing the display, making it easier to open.

Use a hair dryer or a heat gun to heat the bottom edge of the iPhone for 90 seconds or until the screen is slightly too hot to touch.

Never leave your hair dryer in one spot for an extended period of time.

If you have trouble during the opening procedure, the adhesive most likely cooled down. Apply more heat to further soften the adhesive.