How do I fix what if my phone shows “No Service” after switching Korea SIM Card?



Are you planning a trip to Korea?
Everything is ready?

We'd like to inform you about the troubles like below that can occur after replacing with Korean SIM and a simple solution after the arrival in Korea.

Sometimes No Service message appears on your phone screen on the left top thus you are not able to operate your phone and make you dizzy.
In this case, the first thing you can do is turn your cellphone off and on a couple of times a few times. 
- Sometimes it is necessary to repeat 4 ~ 5 times depending on the condition of the mobile phone.
- If there are no problems with your phone or SIM card, this simple way will fix the problem simply by catch the signal of Korea.
- This happens because your cellphone is still trying to find the signal of your country even after when they replace the SIM card of Korea. 
- If you turn it off for a while and reboot, it will catch the signal of Korea normally. It seems to be necessary for the mobile phone to take some time to adjust in an unfamiliar environment.


Secondary check whether the SIM card is properly installed. 
Under the phone turned off, try to insert the SIM card again. If it is not installed properly, it may not recognize the SIM card due to slight difference.

- If it still does not work, please follow the instructions below.
Keep an eye for all the cellular data settings to make sure that no error is caused due to this. 
- Some of the important steps that you need to check for are as follows:

  1. Open tray with the help of paper clip or SIM ejector.
  2. Take out SIM card.
  3. Put the SIM card back and close the tray.

4. Check whether your cellular data settings is set ON or Not and LTE mode is set ON or not.
-  iphone : Visit Settings > Cellular > Cellular Data












-  Android phone : Visit Setting > Mobile Network > Data Network

5. Restart you phone and then check if it will work.

6. If Not working, #contact us with your IMEI number to fix it.
  • How to find IMEI number?
  • - Open your dialer and typing *#06# using the keypad.
  • - It is also found in the menu of Settings app > About Device > Status.

To find out the best SIM Card of Korea, neoksoim.com

Back to FAQ from NeoKOSIM Site


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