b399 App – Fast and Secure Betting on Android and iOS

B399 App's Exclusive Benefits

Why millions of users in Bangladesh choose the b399 app

Lightning-Fast Performance

The b399 app is built on an optimized architecture that runs smoothly even on older Android devices. Enjoy lag-free gaming on low-end phones too.

Low-Data Mode

Low on mobile data? No problem. Enable Low-Data Mode on the b399 app and use the full platform using up to 60% less data than usual.

Real-Time Notifications

Get instant push notifications for match score updates, bonus offers, withdrawal confirmations, and more.

Biometric Login

Dark Mode & Custom Themes

No more eye strain during late-night sessions. The b399 app's Dark Mode is easy on the eyes and helps save battery life.

Auto-Update System

The app is always on the latest version. Background updates mean you never have to download anything manually.

Full English Interface

The b399 app is fully available in Bengali. Everything from menus to notifications is in Bengali, so no English knowledge is needed.

End-to-End Encryption

Every transaction and piece of personal data is kept secure. SSL certification and app-level encryption ensure the highest level of protection.

Live Streaming Integration

Enjoy Live Casino streaming right inside the app. Watch HD-quality video and interact with live dealers in real time.

How Install to do?

Follow the steps below for your device

Note for Android Users

To install the b399 APK file, you need to enable "Unknown Sources" or "Install Unknown Apps" in your phone's settings. This is completely safe.

Visit the b399 Website

Open b399.xyz in your Android phone's browser and go to the "Download App" section.

Download the APK File

Tap the Android APK button. The download will start and typically takes 20-30 seconds.

Enable Unknown Sources in Settings

Go to Settings → Security → Unknown Sources and enable it, or grant permission when the prompt appears during installation.

Install the APK

Tap the downloaded APK file and press "Install". Installation completes in just a few seconds.

Log In and Start Playing

Open the app, log in to your b399 account, and start playing right away.

Android System Requirements

Subject	Minimum	Suggested
Android Version	5.0 (Lollipop)	8.0+
RAM	1 GB	3 GB+
Storage	80 MB	200 MB+
Internet	3G	4G/WiFi
Screen	4 inches	5.5 inches+

Note for iOS Users

On iPhone or iPad, b399 can be added to your home screen as a web app, giving you a native app-like experience.

Open b399.xyz in Safari

Use Safari on iOS. The Add to Home Screen feature may not work in Chrome or other browsers.

Tap the Share Button

Tap the Share icon at the bottom of the screen (the square with an arrow pointing up).

Select "Add to Home Screen"

Find the "Add to Home Screen" option in the Share menu and tap it.

Name it and tap Add

Enter "b399" as the name, then tap "Add" at the top. The icon will be added to your home screen.

Open from Home Screen

From now on, tap the b399 icon on your home screen to launch the app in full-screen mode.

iOS System Requirements

Subject	Minimum	Suggested
IOS Version	12.0	16.0+
Device	IPhone 6s	IPhone 11+
Storage	50 MB	150 MB+
Browser	Safari	Latest Safari
Internet	3G	4G/5G/WiFi

For Mobile Web Users

No installation needed — just open b399.xyz in your mobile browser and access all features instantly. Fully responsive design.

Open Any Browser

Chrome, Firefox, Samsung Internet, or any modern mobile browser will work.

Type b399.xyz

Type b399.xyz in the address bar and press Enter. The site will load in a mobile-optimized view.

Log In or Register

Already have an account? Log in. New here? Sign up in just a few minutes.

Enjoy the Game

Every feature available on desktop is also available on mobile web. You won't miss a thing.

Mobile Web Features

No Storage Cost
Always on the Latest Version
Works on All Browsers
Supports Older Devices Too
No Installation Hassle
Bookmark it for quick access

What's Available Available?

The b399 app is more than just a betting app — it's a complete entertainment platform right on your mobile. Place live bets on cricket, football, tennis, badminton, and 50+ other sports markets, all directly from the app.

Inside the Live Casino section, you'll find dozens of live roulette, baccarat, blackjack, and poker tables — all within the app. HD streaming is fully optimized for mobile screens.

Slots fans will find 300+ slot games on the b399 app, each designed specifically for mobile touchscreens. Swipe to switch games, and adjust your bets with simple touch controls.

Payments are just as simple. Deposit and withdraw directly from the app via mobile banking or bank transfer — the whole process takes just a few minutes.

Sports Betting

50+ Sports Markets

Live Casino

With HD Streaming

Slot Games

300+ Games

Promotions

Exclusive Offers

Payment

Mobile Banking

Support

24/7 Live Chat

About the App FAQ

Answers to Common Questions in Plain Language

Yes, the b399 app is completely free to download and use. There are no charges for downloading or installing — just create an account and enjoy.

The b399 app runs on any device with Android 5.0 (Lollipop) or higher. For the smoothest experience, Android 8.0 and at least 2GB RAM are recommended. On older phones, the mobile web is also a great alternative.

Yes, one b399 account gives you access across the app, mobile web, and desktop. Your balance, betting history, and promotions stay in sync across all platforms.

Yes, everything available on the website is available on the app as well. On top of that, there are mobile-exclusive offers available only to app users. Check the Promotions section for details.

The b399 app usually updates automatically in the background. When a new version is available, you'll get a notification when you open the app and can update with a single tap.

Yes, the b399 app supports deposits and withdrawals via mobile banking, bank transfer, and e-wallets. All payment processing is fully secure and fast.