Official App
Download the 399b App — Get the Best Betting Experience on Android & iOS
Everything 399b offers, available anytime and anywhere. Sports Betting, Live Casino, slots — all in one app.
Everything 399b offers, available anytime and anywhere. Sports Betting, Live Casino, slots — all in one app.
Android, iOS, or straight from your browser — use it however works best for you
Runs smoothly on all Android devices including Samsung, Xiaomi, and Realme. Supports Android 6.0 and above.
Android DownloadGreat performance on iPhone and iPad. Fully supported on iOS 13.0 and above, available on the App Store.
iOS DownloadUse 399b directly in Chrome or Safari with no installation required. Fully responsive design.
Play NowTap the "Android Download" button above. The APK file will start downloading to your phone.
Go to Settings > Security > Unknown Sources and enable it. This only needs to be done once and can be turned off after installation.
Tap the downloaded 399b APK file from your notification bar or Files app.
Follow the installation wizard and tap "Install". The whole process completes in just 30 seconds.
Open the app, log in to your 399b account, or create a new one and start playing right away.
IPhone and iPad users can download the 399b app directly from the App Store — no extra settings changes required.
Exclusive mobile app features you won't get on the website
App caching technology makes it load up to 3 times faster than a browser.
Get instant phone notifications for match kick-offs, bonus offers, and withdrawal updates.
Log in in just one second using your fingerprint or Face ID.
The 399b app runs smoothly even on low internet speeds.
256-bit encryption and two-factor authentication keep your account secure.
Watch selected matches live and place bets in real time — all within the 399b app.
The app always stays on the latest version — no manual updates needed.
Switch on dark mode for easier viewing at night — change the setting with a single tap.
Smartphone usage in Bangladesh grows every year. People now use their phones not just to stay connected, but for entertainment and income too. With that in mind, 399b built its mobile app from the ground up to meet the specific needs of Bangladeshi users.
The first thing you'll notice after downloading the app is how clean and simple the interface is. No cluttered menus or unnecessary buttons — just a straight path to your favourite games. Want to bet on cricket? One tap takes you straight to live matches. Looking for slots? They're right there on the main screen.
Network conditions in Bangladesh aren't always ideal — internet speeds can drop in rural areas or during peak hours. The 399b development team had this in mind when building the app, optimizing it for low-bandwidth environments. Core features work reliably even on 2G networks.
The 399b app supports all major mobile banking options in Bangladesh, including bKash, Nagad, and Rocket. Deposits and withdrawals are handled entirely within the app in just a few taps — no need to open a separate browser.
The 399b mobile app is more than just a betting tool — it's a complete entertainment package. Log in and discover just how much variety is waiting for you.
Sports Betting: Place live and pre-match bets on cricket, football, kabaddi, tennis, and more. Get special odds on IPL, BPL, the English Premier League, and other major tournaments — all within the 399b app.
Live Casino: Play blackjack, roulette, and baccarat with real dealers via HD video streaming. Live tables are open around the clock, even at 3 AM.
Slot Machines: Over 500 slots games at your fingertips, each featuring bonus rounds and free spins.
Bingo & Special Games: Join live bingo rooms and take part in daily tournaments. Virtual Sports and e-sports are also available in the app.
Installing an APK on Android can sometimes run into minor hiccups. No need to worry — most issues are quick and easy to fix.
If you see an "Install blocked" or "Unknown sources not allowed" message, go to Settings > Apps > Special App Access > Install Unknown Apps and grant permission to your browser or File Manager. On Samsung phones, this option is found under Settings > Biometrics and Security.
If your download stalls midway, toggle your Wi-Fi or mobile data connection and try again. The 399b download server is fast — most downloads complete in just 3–5 minutes.
If your issue persists, reach out to 399b's live chat support. Our team is always ready to help in Bangla.
Full compatibility list by popular device and operating system
| Device / Brand | Operating System | Support Level | Performance |
|---|---|---|---|
| Samsung Galaxy Series | Android 8.0+ | Full Support | Excellent |
| Xiaomi / Redmi | Android 7.0+ | Full Support | Excellent |
| Realme / OPPO | Android 8.0+ | Full Support | Good |
| Vivo / Tecno | Android 6.0+ | Basic Support | Good |
| IPhone 8 / SE | IOS 14+ | Full Support | Excellent |
| IPhone 11 / 12 / 13 / 14 | IOS 15+ | Full Support | Maximum |
| IPad | IPadOS 14+ | Full Support | Maximum |
Find answers to the questions you might have