How To Fix Samsung Galaxy J3 Will Not Connect To Mobile Data Network Unless Phone Is Reset

The #Samsung #Galaxy #J3 is a budget friendly smartphone that surprisingly comes with several good features. The latest variant of this device has a 5 inch IPS LCD display, a modest 8MP rear camera, an Exynos 7570 processor combined with 2GB of RAM, and a 2600 mAh battery which can provide more than a day of usage time. Although this is a solid performing device there are instances when certain issues can occur which we will be addressing today. In this latest installment of our troubleshooting series we will tackle the Galaxy J3 will not connect to mobile data network unless reset issue.

If you own a Samsung Galaxy J3 or any other Android device for that matter then feel free to contact us using this form. We will be more than happy to assist you with any concern that you may have with your device. This is a free service we are offering with no strings attached. We however ask that when you do contact us try to be as detailed as possible so that an accurate assessment can be made and the correct solution can be given.  

How To Fix Samsung Galaxy J3 Will Not Connect To Mobile Data Network Unless Phone Is Reset

Problem: My J3 on T-Mobile is getting quite annoying, as when I want to do anything at all using my mobile data, it will not connect no matter what, the wifi connection works flawlessly though. I do have a temporary fix, via tapping “Reset Settings”, which fixes it for a short time before doing it again. After tapping “Reset Settings”, it reboots as normal, and I’m able to use my mobile data again, and continues to work fine for about 3-5 days before doing it all over again. Having to redo your ringtone, your notification sound, screen brightness, sound and keyboard settings every 3-5 days is rather tiresome. I want to find a permanent solution, because if I get in an emergency, I won’t be able to make a call at all unless i reset my settings.

Solution: Before performing any troubleshooting steps on this phone its best to make sure that it is running on the latest software version. If an update is available then I suggest that you download and install it first.

Since you are experiencing a problem connecting to the mobile data network then the first thing you need to do is to make sure that you have an active mobile data subscription.You should also make sure that the phone is getting a strong mobile data signal, preferably LTE.

The next step is to make sure that your phone has the correct APN settings installed.

To access the APN settings of the phone:

  • From the Home screen, tap the Apps icon.
  • Tap Settings > Connections.
  • Tap Mobile networks.
  • Tap Access Point Names.
  • If available, tap the T-Mobile US LTE (the bullet point fills with green). If not available, tap the ADD.

The T-Mobile APN settings are as follows:

  • Name: T-Mobile US LTE
  • APN:
  • Proxy: <Not set>
  • Port: <Not set>
  • Username: <Not set>
  • Password: <Not set>
  • Server: <Not set>
  • MMSC:
  • MMS proxy: <Not set>
  • MMS port: <Not set>
  • MMS protocol: WAP 2.0
  • MCC: 310
  • MNC: 260
  • Authentication type:<Not set>
  • APN type: <Not set> OR Internet+MMS
  • APN protocol: IPv4/IPv6
  • APN roaming protocol: IPv4
  • Enable/disable APN: <greyed out unless there are multiple APN’s>
  • Bearer: Unspecified

In case the issue still persists even with the correct settings and a strong mobile data connection then proceed with the additional troubleshooting steps listed below.

Perform a Soft Reset

The first thing you should do in this case is a soft reset. This is usually done when the phone is unresponsive or when it suffers from a mino software glitch as its software will be refreshed.

  • Press and hold the Power and Volume down key for up to 15 seconds.
  • Wait as the device restarts.

In case your phone model has a removable battery then  just remove the battery then press and hold the power button for at least a minute. Reinsert the battery then turn on the phone.

Check if the issue still occurs.

Wipe the cache partition of the phone

If the soft reset you performed does not fix the problem then the next step is to wipe the cache partition of the phone. This will delete the temporary data stored by the phone software which if corrupted can cause this problem.

  • Turn off the phone.
  • Press and hold the Volume Up and Home keys.
  • Press and hold the Power key until the device vibrates, then release it. Keep pressing the Volume Up and Home keys the entire time.
  • When you see the Android Recovery screen, release the Volume Up and Home keys.
  • Use the Volume keys to scroll down to Wipe cache partition, then use the Power key to select it.
  • Use the Volume keys to scroll down to Yes, then use the Power key to select it.
  • Use the Volume keys to scroll down to Reboot system now, then use the Power key to select it.

Check if the issue still occurs.

Perform a factory reset

One last troubleshooting step to consider is a factory reset. This will revert the phone back to its original factory condition and will usually fix the problem in case is is caused by a software glitch. Make sure to backup your phone data before doing the reset.

  • Turn off the phone.
  • Press and hold the Volume Up key and the Home key, then press and hold the Power key.
  • When the device logo screen displays, release only the Power key
  • When the Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  • Press the Volume down key several times key to highlight ‘wipe data / factory reset.’
  • Press Power button to select.
  • Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
  • Press Power button to select and start the master reset.
  • When the master reset is complete, ‘Reboot system now’ is highlighted.
  • Press the Power key to restart the device.

Once the reset is complete make sure to check the APN settings of the phone first and make sure that it is correct. Do not install any apps yet. Try checking first if the issue still occurs. In case the problem persists then you will need to bring the phone to a service center and have it checked.

Feel free to send us your questions, suggestions and problems you’ve encountered while using your Android phone. We support every Android device that is available in the market today. And don’t worry, we won’t charge you a single penny for your questions. Contact us using this form. We read every message we receive but can’t guarantee a quick response. If we were able to help you, please help us spread the word by sharing our posts with your friends.

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Chad Buenaflor

Chad has been in the tech industry since 2000. He has a degree in Electronics Engineering and is interested in the hardware and software side of technology. Initially working for a Japanese semiconductor company as a Test Engineer for nearly 10 years, he then pursued his passion for internet technology by working for the support team of Time Warner Cable then finally joining TheDroidGuy as one of their troubleshooting and tech writers. On his free time he plays his favorite games on his PC, Xbox Series X, and Android phone. Contact me at Email

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