Article in English: WhatsApp can be downloaded for free from the Play Store on Android or the App Store on iOS by searching for WhatsApp in the search bar. If you are already using WhatsApp on a phone, uninstall and reinstall the app to use the new phone number. The app icon is a white phone on a bright green background. You can find it either on your home screen or in your app drawer or list.  WhatsApp will send a text message to this number.  If you did not receive the message, you can either tap on Resend SMS or Call me to receive the verification code. The app will automatically verify the number once entered. Select "Continue" if you want to backup WhatsApp to Google Drive at this point. You have now activated WhatsApp by using an alternate phone number.

Summary in Chinese:
在手机或平板电脑上安装WhatsApp。 打开WhatsApp。 点击屏幕底部的同意并继续。 在方框中输入新的电话号码并点击下一步。 点击弹出窗口中的确定来验证电话号码。 打开Google Voice中的验证短信。 在WhatsApp中输入验证码。 点击弹出窗口中的现在不行或继续。 在下一个界面中输入你的名字以完成设置。