The iPhone was created by Apple to be a personal organiser, business tool, entertainment centre and communication device rolled into one. One popular means of communicating with others is using the email feature of the iPhone. The email feature allows for a degree of customisation, including the ability to increase or decrease the font size in e-mails. Change the font size of e-mail text to whatever you prefer.
Turn the iPhone on and access the applications of the phone. This may require turning the phone completely on or activating from the standby mode.
Locate the "Settings" application on the iPhone. Look for a gray scale picture featuring three machine gears. Tap on the application so that it will open the Settings page.
Scroll down the Settings page to locate the "Mail, Contacts, Calendars" heading. This will be noted to the side with a picture of a white envelope on a blue background. Tap on the the right-facing arrow to the right of the picture and heading.
Pull the screen upward to scroll past the "Account" section to "Mail" settings. Look for the sub heading "Minimum Font Size." To the right of the subheading will be the word "Medium," which is typically the factory default setting.
Tap on the right-facing arrow to open the Minimum Font Size screen. Select the desired font size from small to giant by tapping on the word. Close the screen by tapping on the back arrow at the top of the screen. Continue to back out using the subsequent back arrows. At the Settings screen press the "Home" button on the bottom of the phone.