Methods/Steps Sometimes when we download an application on Apple's iPhone, the current network connection speed is unstable, which makes it impossible to download the application. The prompt shown in the figure below is the prompt when we download the application incorrectly. Under normal circumstances, we can click the "Retry" button to try again. If there is always a hint that the application cannot be downloaded, then we can try to change the DNS address of the wireless Wifi network and improve the connection effect between the mobile phone and the Apple App download server. First, open the "Settings" application on your mobile phone, and click the "WLAN" column in the settings list, as shown in the figure. Then, in the wireless LAN list as shown in the figure, click the exclamation point icon to the right of the currently connected wireless network. Then, in the network parameter interface of wireless network, click the DNS column, as shown in the figure, delete all the original DNS addresses and enter a new 8.8.8.8 address. As shown in the figure, we will click on the application that cannot be downloaded, and then try to download it. If it still doesn't work, you can turn it off and then on. Press and hold the power button on the top of the iPhone. When the power off option appears, slide the slider to turn it off.