This rant/warning is aimed at the masses that are currently upgrading their iPhones to iOS 7.0 and to anyone before they upgrade anything else. Please backup your device before you upgrade. Software upgrades don't always go smoothly and the data on your phone will suddenly become more valuable than gold when it disappears. For my iPhone friends, it's easy, just plug your phone into iTunes and don't upgrade when prompted. Go to the iPhone view and click on backup. Then once you're backup is done, click upgrade and enjoy.
Another thing to consider is to use the free iCloud service to backup your contacts, bookmarks and other settings on your iPhone. You can also backup photos, but storage beyond the initial freebie is a pay service. Myself I backup my photos to Dropbox automatically when I plug my phone into my computer.
Help us geeks help you, backup so we can recover your data after we fix the problem. :)