Remove the metal handle from the suction cup. It's easier and safer to grip the suction cup's base instead of the metal handle.
Be very careful when opening the iPhone so that the cables under the display are not severed.
There is a rubber gasket between the silver front bezel and black display assembly. A bit of force is required in this step to separate the iPhone's display assembly.
Use a small suction cup near the Home button to gently pull up the bottom portion of the iPhone's display assembly.
If the display assembly is too damaged to allow the suction cup to adhere, tape with a strong adhesive such as duct tape may be used.
Use a spudger to flip up the black plastic tab holding the remaining ribbon cable in place. The black will rotate up 90 degrees, releasing the ribbon cable.
The tab is very fragile, so be careful when flipping it up to unlock the cable and down to lock the cable.
The plastic tab may be white (instead of black) on some iPhone models.
Slide the ribbon cable out of its connector, and remove the display assembly from the iPhone.
Slide the pointed end of the spudger into the slot under the upper right corner of the ear speaker and gently pry upwards.
Be careful during this step, as the upper portion of the speaker can easily detach from the lower portion, causing the coil inside to unwind. Be sure to pry the entire assembly up.