How to enlarge the one on iphone4? The (very long) one saved from Weibo can only be enlarged a little and can't be seen clearly.

Sure! In Settings-General-Auxiliary Options-Zoom! You can also double-click the Home button from below to set the shortcut key for zooming.

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Many applications allow you to zoom in or out of a specific project. For example, you can double-click or open in Safari to expand the page bar. However, zoom accessibility also allows you to enlarge the entire screen of any application you are using. In addition, you can use scaling with VoiceOver.

Turn zoom on or off: go to settings > general > accessibility > zoom. Alternatively, use "Press the Home button three times". See Triple-clicking the Home button.

Zoom in or out: Press the screen twice with three fingers.

Change the magnification: click with three fingers and drag up and down. The "tap and drag" gesture is similar to "double click", except that the second tap does not move the finger away, but drags the finger on the screen. After you start dragging, you can drag with one finger. When you zoom with three fingers again, the iPhone will return to the adjusted magnification.

Move on the screen: When zooming in, drag on the screen with three fingers. After you start dragging, you can drag with one finger so that you can see more parts of the screen. Or, press and hold a finger near the edge of the display screen and move to this side. The closer your finger is to the edge of the screen, the faster the screen moves. When you open a new screen, the zoom is at the top and middle of the screen.

When the zoom function is used with Apple Wireless Keyboard (see Apple Wireless Keyboard), the screen image will follow the insertion point, so as to be centered on the display.