The iPhone has a settings menu where you can change the factory default settings in effect when you took your new phone out of the box. You can personalize most of these settings, including those for the Safari Web browser, email, SMS messages, photos and general settings. Adjusting the iPhone settings to your personal preferences makes it easier to work with the device whether you are using the phone, sending text messages or utilizing other features.
Press the "Home" button on your iPhone. This action closes any screens you have opened and brings you to the main screen.
Tap the "Settings" icon in the home screen. Several configuration sections will be displayed. Tap the section you want to edit. For instance, if you want to change the Web browser settings, press "Safari."