The specific steps are as follows:
1. Unlock the phone interface and find the "Settings" option. Find "iTunes Store and App Store" under the settings page, as shown in the figure below:
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2. Click on the Apple ID account under the iTunes Store and App Store pages and select "View Apple ID", as shown below:
3. Enter the Apple ID password and log in, log in Click "Payment Information" under the account settings page, as shown below:
3. Under the "Payment Method" option, we change the original payment method to "None" and click Finish, as shown below Shown:
Extended information
Function settings
Screen and camera
The iPhone includes the media playback functions of the iPod and is designed for mobile use. The device has a modified Mac OS X operating system (iOS, formerly known as iPhone OS, renamed iOS since version 4.0), and an 8-megapixel camera. (The first and second generations are 2 million, the 3GS is 3.2 million, supports autofocus, the fourth generation is upgraded to back-illuminated 5 million, and the 4S released in 2011 is increased to 8 million and uses a 2.4f large aperture) In addition, the device has built-in gravity Sensor, iPhone4 has a three-axis gyroscope (three-axis gravity sensor), which can automatically adjust the screen display direction according to the user's horizontal or vertical holding method.
It also has a built-in light sensor that supports adjusting the screen brightness according to the current light intensity. It also has a built-in distance sensor to prevent operations caused by accidentally touching the screen with your ear when making or receiving calls. The iPhone 4S and 5 released in September 2012 added a new camera mode - panoramic mode. In this mode, you can use iPhone 4S and 5 to take panoramic photos, and the panoramic photos can reach 28 million pixels.
Mobile phone, widescreen iPod and Internet device - iPhone combines three major functions into one. Through iPhone's multi-touch (Multi-Touch) technology, you can make calls and navigate between applications with just a tap of your finger. It's also easy. You can also copy and paste text and images directly from the website. It is also the world's first mass-produced commercial smartphone using a capacitive screen.