I tried everything possible to make my phone start up, which had been dead for a month. I did not want to buy a $75 replacement battery from Apple, so I bought this one for $3.77. As soon as I put it in, I held my power button and saw the Apple logo; I was so relieved. This was so easy and arrived very timely. I am also super glad that I ordered a battery that came with the tools because those were very necessary for replacing the battery and made it so easy. This task was so quick and so helpful. I am really happy with this product. Also, before I replaced the battery, my battery was so bad and my phone would die within minutes of unplugging it, especially if I used the camera. With this battery, my phone's life has been perfect and I've only had it die once, after hours of taking pictures and videos with it. I am so glad that I bought this for its great quality and price!