Bian is Binance, the world's #1 crypto exchange. Register on the official website, then download the Bian APP.
Android: Download APK (80-120MB), enable unknown source, install. Brand-specific: Huawei (add trust), Xiaomi (confirm twice), OPPO/vivo (enable in settings).
iPhone: Create overseas Apple ID at appleid.apple.com (US, address: 1 Infinite Loop, Cupertino, CA 95014). Sign in App Store, search "Binance", download.
Desktop: Windows (.exe, bypass SmartScreen) and Mac (.dmg, allow in Security preferences).
Essential Setup: Register (8+ char password), KYC (5 min), Google Authenticator (mandatory), anti-phishing code, login device management, withdrawal whitelist.
Updates: Android via in-app or re-download. iPhone via App Store with overseas ID.
Summary
Official channels only. Android: enable install permission. iPhone: overseas Apple ID. Complete security settings after installation.