How do I fix what if my phone shows “SIM Not Valid” or request to enter “SIM Network Unlock PIN” after switching Korea SIM Card?

Hi The Korean Lovers and travelers planning to visit Korea,

Let us inform the important thing concerning the mobile phone.
If you want to use your phone freely when traveling abroad, you should have a unlocked phone as you know generally. 
After your arrival in Korea, if your mobile phone does not work with the following message as replacing the Korea SIM, it may cause a lot of inconvenience to your pleasant trip.

After inserting your Korea SIM and powering on the device, note whether your phone shows any error messages such as "Invalid SIM" , " SIM Not Supported" , "SIM Not Valid" or if you receive a request for a SIM Network Unlock PIN.
locked iphone
locked iphone

If you see any of these messages, your device is most likely locked to your carrier.
Case of Android phone

A locked phone means that it can only be used with a SIM card from the carrier that originally sold the phone and your phone is restricted for the use of other companies' SIM cards.
If you originally purchased your device coupled with a plan from a carrier, it's likely locked to that carrier.

To use our service, your phone must be unlocked .
But if your phone is locked, Contact your current wireless provider and solve this issue before your travel.

Your mobile provider will unlock your phone for a small fee. Certain conditions may apply. Contact them and ask for a phone unlock.

To meet the best SIM Card Korea, visit

Back to FAQ from NeoKOSIM Site

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