1. Settings - General - Accessibility - VoiceOver - Turn on

2. Then you can hear the simulated human voice, which means that the speaker is good.

3. Then return to the home screen and open the music. If the music can be played, it means it can be played externally.

4. Finally, return to VoiceOver and close it.

1. hone4 is the fourth generation touch screen 3G smartphone developed by Apple.

2. Compared with the iPhone 3GS, the main differences of the fourth generation include the new design of the stainless steel mobile phone frame, the latest Apple A4 processor and 512 MB of DRAM, and the 3.5-inch Retina display with a resolution of 960×640 pixels. screen.

3. iPhone 4 has added a new video calling function (Facetime), which improves the user experience in reading, video, music and games.

4. On June 8, 2010, Steve Jobs released the iPhone 4 at the Apple Worldwide Developers Conference (WWDC 10) held at the Moscone West Convention and Exhibition Center in the United States. At the end of April 2011, the white iPhone 4 For sale in mainland China.