Remove the three Phillips #00 screws securing the rear panel to the iPhone.

Getting the iPhone open is a challenging feat, so don't get discouraged. Take a deep breath and make sure you have plenty of time to get the job done.

The small square hole is the location to insert the dental pick in the next step.

Start removing the rear panel on the side with the buttons.

Slide the dental pick completely into the square hole. You may need to wiggle the tool and apply a good amount of force to get it to go all the way.