When installing applications on a mobile device, the DOWNLOAD and installation steps differ between different systems (Android and iOS) due to variations in security mechanisms. Below is a clear and easy-to-understand tutorial to help users understand the typical DOWNLOAD methods for applications on both systems. This is for technical reference only. I. Preparation Before Downloading Before starting, ensure the following: Maintain a stable mobile network (4G/5G/WiFi are all acceptable) Allow sufficient storage space Be aware that installing apps downloaded from a browser may require additional authorization. It is recommended to obtain the installation package from official channels to avoid security risks associated with third-party sources. II. Android System DOWNLOAD Tutorial Step 1: Open a browser and visit the official download page Use your phone's built-in browser or Chrome to access the official website of the corresponding application. Step 2: Click the "Android Download" button Most websites will provide an installation package in .APK format. Step 3: Allow the browser to download the APK file On the first download, the system may display a prompt: "This type of file may pose a risk. Do you want to continue downloading?" → Click "Continue" or "Download" Some phone brands require users to enable "Allow installation from this source" Step 4: Open the downloaded APAPKile The installation package can be found in the following locations: Browser download menu File Manager → Downloads folder Step 5: Authorize and start installation The system will display a prompt: "You need to allow installation of apps from unknown sources" → Click "Settings" → Turn on the switch → Return to continue installation The installation process takes approximately 5–20 seconds. Step 6: Complete installation and open the app AfterAPPstallation, choose: "Open" to launch immediately "Done" to launch on the home screen HOMEr III. Apple (iOS) System Download Tutorial (iPhone / iPad) Apple's system has stricter management of third-party applications, so the process is slightly different. Method 1: Installation via Official Website Guided by Enterprise Signature/Profile (Common Method) ⚠️ Note: Installing a profile carries some risk; it is only recommended when using a trusted source. Step 1: Open the official website download page in Safari. iOS usually requIOSs Safari to install the profile. Step 2: Tap the "iOS Download" button. The system will prompt: "This website is attempting to download a profile." → Select "Allow". Step 3: Install the profile in system settings. Go to: Settings → Downloaded Profiles (top) → Install Enter your phone password to continue installation. Step 4: Return to the home screen and wait fHOMEhe icon to install. The app icon will appear on the home screen after installation. Step 5: Trust the certificate. The system may display: "Untrusted Enterprise Developer" upon first opening. Path: Settings → General → Device Management / VPN & Device Management → Trust Certificate Then it should open normally. Method 2: Install via TestFlight (Available on some platforms) If the official website offers TestFlight, you can install the app more securely. Brief APPps: Download TestFlight from the App Store Open the test link provided on the official website TestFlight will automatically redirect and allow installation Once completed, it can be used normally. IV. Frequently Asked Questions (FAQ) 1. What if I can't install after downloading? Android: Check if "Unknown sources app installation permission"APP disabled. iOS: Check if the certificate is not trusted or if Safari is not being used. 2. The icon shows "Waiting" or remains stationary? Check your network. Restart your phone. Delete the icon and download again. 3. The downloaded installation package cannot be opened? The file may be corrupted. It is recommended to download again and verify the source is safe. V. Security Recommendations for Installing Apps on Your Phone Only download from official websites. Avoid installation packages provided by third-party websites. Regularly check your phone's permission settings. Do not install profiles from unknown sources. Enable virus scanning and system updates on your phone.