How to fix Galaxy S9 Plus showing “Not registered on network” error when making a call

Are you getting “Not registered on network” error on your #GalaxyS9Plus lately? You may be one of the many S9 users who recently encountered this error. At this time, we don’t know if this happening to a certain subset of users only but we should be able to get some pattern in the next few days. We will try to update this post once we get definitive answers for the problem. Right now, we believe this may only be true to some users in the United States. Let’s see how this issue develops. In the meantime, keep watching for our next articles.

Today’s problem: Galaxy S9 Plus “Not registered on network” error when making a call

I was using my phone fine. my bill is not due for 2 more days and I have had this phone over a month now. It is a brand new S9 Plus out of the box with Simple Mobile. I was receiving and sending texts just fine, I was calling and receiving calls just fine as well when all of a sudden out of the blue right after I received a text message, I tried to reply and it said I have to wait for network service to send message. At the top of my screen there is a little triangle with two Ms under it. In the notifications pull down screen it says PHONE NOT ALLOWED. When I try to make a phone call it says NOT REGISTERED ON NETWORK. I have tried to reset all settings and my phone and have talked to my phone company and nothing has worked. Please help. — Shaina girard

Solution: Hi Shaina. Because your phone was working fine before the issue occured, the most likely reason for it must be account-related. We’ve also seen this issue before for a small subset of Android users who had issues with their SIM card so before you talk to your carrier about it, we suggest that you do the troubleshooting steps below.

Solution #1: Reboot your device manually

Many Android users were able to successfully fix calling and network-related issues by forcefully restarting their device. With old devices that had detachable battery packs, this is done by simply disconnecting the battery from the motherboard for a few seconds. With your Galaxy S9 Plus, battery removal is obviously borderline impossible so you’ll have to press a hardware button combination to simulate the same result. This should clear the system and hopefully fix the issue you’re having. Here’s how to do it:

  1. Press and hold the Power + Volume Down buttons for approximately 10 seconds or until the device power cycles. Allow several seconds for the Maintenance Boot Mode screen to appear.
  2. From the Maintenance Boot Mode screen, select Normal Boot. You can use the volume buttons to cycle through the available options and the lower left button (below the volume buttons) to select. Wait for up to 90 seconds for the reset to complete.

Solution #2: Reset network settings

“Not registered on network” error can also be a direct result of outdated or incorrect network configuration. To ensure that your S9 has the correct or default network setup, you can try to reset its network settings.

  1. Open Settings app.
  2. Tap General management.
  3. Tap Reset.
  4. Tap Reset Network settings.
  5. Tap RESET SETTINGS button to confirm.
  6. Restart your S8 and check for the problem.

Solution #3: Reseat SIM card

Some users were able to successfully fix network problems by simply disconnecting their SIM cards. If you haven’t tried this before, here’s what you need to do exactly:

  1. Turn off your phone.
  2. Remove the SIM card carefully.
  3. Wait for at least 10 seconds before turning the phone back on.
  4. Then, re-insert the SIM card and check for the problem.

Solution #4: Replace the SIM card

Trying another SIM card can also be a good way to fix network issues. If reseating the SIM card won’t change anything, consider getting a new one. It’s possible that the current SIM card may no longer be working properly, especially if it’s a carry-over from an old device.

Solution #5: Return all software settings to defaults

Network problems can also be a product of operating system glitch. If the issue remains at this  juncture, you must factory reset your device to get rid of possible software causes. This is the most that you can do in terms of doing software solutions. If the reason for “Not registered on network” error is software in nature, factory reset will most likely fix it. Here’s what you need to do:

  1. Create a backup of your data such as photos, videos, documents, etc.
  2. Turn off the device.
  3. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  4. When the green Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  5. Press the Volume down key several times to highlight ‘wipe data / factory reset’.
  6. Press Power button to select.
  7. Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
  8. Press Power button to select and start the master reset.
  9. When the master reset is complete, ‘Reboot system now’ is highlighted.
  10. Press the Power key to restart the device.

Solution #6: Work with your network operator

Should the problem remain after doing all solutions above, the cause is most probably beyond your ability to fix. Remember, not all network glitches like “Not registered on network” error is not necessarily due to a phone issue only. By following our suggestions above, you’ve already covered all the common causes that can come from your phone. This leaves you with a possible hardware malfunction or network-side issue. Be sure to get support from your carrier by asking them to check your account or their network performance in your area.


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