And the "no cracked screens" provision is because access to the battery on most iPhones is from the top side, by lifting the display with a suction cup. If the

And the "no cracked screens" provision is because access to the battery on most iPhones is from the top side, by lifting the display with a suction cup. If the glass is already cracked, lifting it is likely to cause further damage, and it may not go back in afterwards.