Editor’s Note: The following article is an excerpt from the just-released Take Control of Your iPhone, a $15 electronic book ($10 through December) available for download from TidBits Publishing. The 195-page ebook helps readers understand what’s going on under the hood of the iPhone, with lots of tips for using the iPhone more effectively and an emphasis on troubleshooting assistance for solving problems related to activating, syncing, application crashes, iPhone freezes, handset security, and more.

read it here macworld