iPhone 3GS LCD Screen Reassembly Directions for IP-2321. This LCD screen assembly for the iPhone 3GS is available at These are step by step on how to re-install the iPhone 3GS LCD screen Part IP-2321. This is part of the complete guides to taking apart your iPhone 3G and Smartphone units. For 5% off your first order on our webpage use coupon code YOUTUBE at checkout for a limited time only.