First heat up the back of the device with a heat gun or, if available, a heat plate.

Then position the suction handle on the lower half of the device and begin to pull up, while trying to insert a plastic pick between the midframe and the back plate.

Once you've got your pick between the two parts, begin to work yourself around the device with some more picks.

Be careful around the camera bump and the mid of the device, because of the exposed battery there.