With arthritis in my hands, I was having difficulty getting the case off of my android phone, and did not have any tool that would fit the tiny screws on the back cover. The plastic blue tool to open one's phone case is great. It is easy to use and doesn't damage the phone. The small screwdriver suggested by ifixit for removing screws on the back of the phone fit perfectly. The tip is magnetized, which is very helpful for not losing the screws.
My advice: Use ifixit.com for your repair needs. This was my first time using ifixit.com and I was very happy with the results.