How to fix slow wifi issue on Galaxy J3

Slow wifi issue is a common problem for many smartphone users. In this post, we help a Galaxy J3 user deal with this issue. If you have the same problem, make sure to do the basic troubleshooting steps first like the ones mentioned by the user: soft reset, forget wifi network, reset network settings, cache partition wipe. If none of these steps will help, then do what we suggest below.

Problem: Galaxy J3 wifi is very slow

I have AT&T Internet 18 for home WiFi. I also have an AT&T Samsung Galaxy J3. When we first got the WiFi and I connected my phone to it, it worked GREAT! Now for some reason my download and upload speeds have decreased drastically! I’ve troubleshooted and speed tested my WiFi Gateway and it’s perfectly fine and all of my other devices connected to it run fine as well. I have done a soft reset on my phone, I’ve forgot my WiFi network, I’ve cleared the cache in recovery mode and rebooted the phone, and I’ve also reset the network settings but it’s still running extremely slow. Is there anything else I can do to fix the issue? ?

Solution: The cause of the problem is most likely within your device. We suspect it’s an app issue. There may be an app that hogs all the bandwidth whenever you’re on wifi. This can be due to inefficient coding, or worse, malware. To check, try doing a speed test when your phone is on Safe Mode.

To restart your phone to Safe Mode:

  1. Turn the device off.
  2. Press and hold the Power key past the model name screen.
  3. When “SAMSUNG” appears on the screen, release the Power key.
  4. Immediately after releasing the Power key, press and hold the Volume down key.
  5. Continue to hold the Volume down key until the device finishes restarting.
  6. Safe mode will display in the bottom left corner of the screen.
  7. Release the Volume down key when you see Safe Mode.

Now that your J3 has been set to safe mode, all downloaded apps can’t run. In this mode, you can only use the apps that came with the Operating System, effectively taking third party apps out of the equation. Since you can’t use any speed test app that you downloaded to check the download speed and upload speed of your wifi, what you can do is to use pre-installed apps to get a sense of the general performance of your wifi network. You can do that by streaming some videos on apps that you can use. This is not an accurate way of knowing whether or not wifi speed has improved but it should tell you if there’s a difference now that there are no third party apps. Some carrier-provided firmware may include YouTube app as pre-installed so you can use that. If video streaming speed is back to normal (no lags, no freezing, no buffering), that means an app is most likely causing the slow down.

To identify which of your apps is causing the trouble, you should boot the phone back to safe mode and follow these steps:

  1. Boot to safe mode.
  2. Check for the problem.
  3. Once you’ve confirmed that a third party app is to blame, you can start uninstalling apps individually. We suggest that you begin with the most recent ones you added.
  4. After you uninstall an app, restart the phone to normal mode and check for the problem.
  5. If your J3 is still problematic, repeat steps 1-4.

How to prevent malware on your Galaxy J3

Legitimate apps seldom causes mobile data or wifi speed interruptions or slow downs. However, some malware or bad apps usually do. To prevent installing bad apps to your device, you have to discipline yourself when it comes to selecting apps. Some apps may disguise themselves as legit ones. Once you’ve installed them, they may start compromising the system so that they can do what they’re designed to do. Some bad apps may come as innocent games but would later on install other apps or malware to further infect the system. Some may hijack the system so that they display ads or ad popups. Others may allow other bad apps that can steal information or monitor your browsing habits. Some other bad apps may also constantly run in the background using internet bandwidth to do tasks.

If you think your J3 has been infected with malware or bad app, you should try to clean it with factory reset. Here’s how:

  1. Back up data on the internal memory. If you have signed into a Samsung account on the device, you have activated Anti-theft and will need your Samsung credentials to finish the master reset.
  2. From the Home screen, swipe up on an empty spot to open the Apps tray.
  3. Tap Settings > Cloud and accounts > Backup and restore.
  4. Tap the following sliders to desired setting:
  5. Back up my data
  6. Automatic restore
  7. Tap the Back key (bottom right) until you reach the main Settings menu.
  8. Tap General Management > Reset > Factory data reset.
  9. Scroll to the bottom of the screen, then tap RESET > DELETE ALL.
  10. If you have screen lock turned on, enter your credentials.
  11. If prompted to verify your Samsung account, enter the password, then tap CONFIRM.
  12. Wait for the device to reset.

Once you’ve factory reset your device, make sure not to reinfect it by installing apps from reputable developers. If the problem returns after a factory reset, that means you simply re-installed the bad app.

Use antivirus app

There’s a constant cat-and-mouse battle between good guys and bad guys in Android world. Still, we highly recommend that you install one good antivirus app on your device to help prevent installation of bad apps. Make sure that you only have one as having two or more can severely lead to performance issues.