399 days APK — Easy to Install on Android and Play Anytime
The 399 days Android app is available as an APK file through official channels. This guide covers everything from installation to updates, step by step — so you can get started safely and correctly.
What Is an APK and Where Does the 399 days App Come From
A special type of file is used to install any app on an Android phone, called an APK — short for Android Package Kit. Apps available on the Google Play Store are also packaged in APK format — the Store itself just handles the download and installation. Installing an APK from outside the Play Store is known as "sideloading".
The 399 days Android app is available as an APK file through official channels. There is also a separate version for iOS users. The app gives you access to everything on the site — slot games, live casino, sports betting and payments — all in a mobile-friendly interface.
Remember: always get the APK from official sources only. Never install files sent from third-party websites, Telegram groups or Facebook messages — this is covered in detail further down this page.
Steps to Install the 399 days APK
Allow installation from unknown sources
On your Android phone, go to Settings and look for "Apps" or "Biometrics and Security", then enable "Install unknown apps" or "Unknown sources". The exact name of this option may vary by phone model — it usually appears as a permission setting for your file manager or browser app.
Open the APK file
Find the APK file you received from the official channel in your phone's file manager — it is usually in the "Downloads" folder. Tap the file to begin the installation process.
Tap the Install button
A confirmation window will appear on screen showing the app name and the permissions it requires. Read through the details and tap "Install". Installation normally takes a few seconds.
Open the app
Once installation is complete, an "Open" button will appear, or a 399 days icon will be created on your home screen. Tap it to launch the app.
Log in
After opening the app, log in with your account username and password. If you are a new user, you can create an account by registering.
Start playing
After logging in, make a deposit and choose the game you want. You can start with as little as ৳200 via bKash, Nagad, Rocket, Upay or bank transfer.
How to Update the App
The 399 days APK is regularly improved — new games, features and performance upgrades are added. Running the latest version gives you the best experience. The update process is just as straightforward as the installation:
- Get the new APK — download the latest version file from the official channel.
- No need to uninstall the old app — installing the new APK directly replaces the old version and your account data remains intact.
- Open and install the new file — tap "Update" and the version will be replaced.
- Your login details stay the same — your password and balance will not change after the update.
What to Do If Installation Fails
Not enough storage
If your phone is low on space, the installation may stop partway through. Delete unused photos, old apps or cached data, then try again. Go to "Storage" in your phone's Settings to see how much space needs to be freed up.
Installation is being blocked
Many Android phones block apps from unknown sources by default. Go to Settings and find "App permissions" or "Install unknown apps", then enable permission for the app you are using to open the APK (such as your file manager).
App won't open or keeps closing
If the app does not open after installation, restart your phone first. If the problem persists, uninstall the app and install it again. Make sure your phone has enough free RAM and that your internet connection is working.
Stay Safe — Use Official APKs Only
The biggest risk when installing an APK on mobile is getting the file from an unverified source. Many fake apps circulate online — they may look like the real 399 days app but can contain malware or data-stealing code.
Always get the APK from official channels only. That is the only reliable source.
Do not install any APK file sent from a Telegram group. These groups are often fake.
Avoid APKs sent via Facebook posts or messages — these may be fraudulent.
Do not download APKs from unfamiliar websites — check the URL carefully.
Keep your phone's security software active so that harmful files are detected automatically.
What You Get in the App
Installing the 399 days APK puts the full platform in your pocket. You can jump straight into games or betting without opening a browser.
- Slots, live casino and fishing games all in one place
- Cricket betting on BPL, IPL and T20 with live updates
- Fast payments via bKash, Nagad, Rocket, Upay and bank transfer
- Withdrawals in just 5–30 minutes
- Full VIP programme benefits available in the app
- Never miss a bonus update with push notifications
The app works like the mobile browser version but loads faster and navigation is smoother. Learn more about the 399 days App.
Get Started on 399 days with the App
After installing the APK, your first deposit earns a 100% bonus up to ৳8,000 — wagering is 15x the bonus amount. Example: deposit ৳1,000 and receive a ৳1,000 bonus — total balance ৳2,000, wagering ৳15,000. Minimum deposit is just ৳200, and withdrawals take 5–30 minutes. View all bonus offers and take advantage of the opportunity.