Amazon.com gives you thousand types of content and you can download your desired book for reading. When the first kindle was launched its only use for reading eBooks but now you can do numerous things on your kindle. Some of our readers have found that their Kindle stuck on the message,”Optimizing system storage and applications” or keeps showing this message repeatedly. If you also are also facing this message in your Kindle then call on Kindle Customer Service Phone Number 0-800- 098-8929. It’s a toll free number for UK and you can make a call on this number at 24*7.