Why iPhone Says SIM Failure and How to Fix This Problem

사무엘 스펜서 게시일 2026년 10월 9일iOS 잠금 해제3분 읽기

“I got a new iPhone this year. All of a sudden, today I began getting a message that says SIM card failure. I haven't dropped or damaged my phone at all. Any ideas?”

While the iPhone comes with a wide variety of features, most of them require a SIM card and wireless signals. If it cannot detect the SIM card, these features are unavailable, such as phone calls, SMS, and more. This guide walks you through solutions to fix SIM failure on an iPhone.

Part 1: What Does SIM Failure Mean on iPhone

What does SIM Failure mean on an iPhone? It means that your iPhone can see that a SIM card is inserted, but something blocks it from being recognized by your mobile network. In addition to SIM Failure, you may also see the error message, such as Invalid SIM, SIM Not Supported, or SIM Not Valid.

Why does my iPhone keep saying SIM Failure? First of all, you need to rule out any hardware damage, like water damage. If the error occurs suddenly, the common causes may include:

• 1.Something is wrong with the SIM card.
• 2.Network issues.
• 3.Your iPhone doesn't load the SIM card properly.
• 4.Outdated software or carrier settings.
• 5.소프트웨어 오류가 있는 경우.
• 6.Your iPhone is locked to a specific carrier.

Part 2: How to Fix iPhone Says No SIM

Solution 1: Disable Airplane Mode

Network issues may be responsible for your iPhone not recognizing the SIM card. If you accidentally turn on Airplane Mode on your device, you will encounter network errors. The solution is simple: turning off Airplane Mode on your iPhone.

옵션 1:

입력하세요 제어 센터 당신의 아이폰에.

을 누릅니다 비행기 모드 button to turn it off. If it is disabled, turn it on and then disable it.

옵션 2:

실행 설정 app from the home screen.

찾기 비행기 모드 option, and toggle it off.

해결 방법 2: SIM 카드 다시 끼우기

When an iPhone keeps saying No SIM, it means that your device cannot see the SIM card. That may be due to a loose card, improper placement, or a damaged SIM card. To fix this problem, you need to take out the card from your device.

솔루션 3: iPhone을 다시 시작하세요

Another simple solution to fix iPhone not detecting the SIM card is to restart your device. That can refresh the operating system and let it detect the SIM card again. For an iPhone, you can complete the process with physical buttons.

For older models, hold down the 옆 단추.

Solution 4: Update Carrier Settings

Your iPhone does not read the SIM card partly because the carrier settings are outdated. By default, iOS is able to detect and install the update automatically. If not, you will need to update the carrier settings manually.

Solution 5: Update iPhone Software

Outdated software is another cause that your iPhone keeps saying SIM Failure. In fact, outdated software can lead to a lot of issues. Therefore, Apple suggests users keep software up to date on their iPhones.

해결 방법 6: 네트워크 설정 재설정

Conflict settings can lead to the SIM Failure error on iPhone, too. It is difficult to identify which changes cause the problem, but you can reset all network settings with a single option on your iPhone.

Solution 7: Check if Your iPhone Is Locked to a Carrier

One main reason why my iPhone says SIM Failure is that your device is carrier-locked. Once you insert a SIM card from another carrier, your iPhone cannot read the signal. Check if your iPhone is locked to a carrier following the steps below:

Part 3: How to Unlock SIM Lock on an iPhone

If your iPhone doesn't recognize SIM card because your device is locked to the previous carrier, imyPass 아이패스고 can help you fix this problem quickly. It can remove the SIM lock from your iPhone without any restrictions. Furthermore, the clear design helps you simplify the workflow.

iPhone에서 SIM 카드 잠금 해제하는 방법

컴퓨터에 설치한 후 SIM 잠금 해제 소프트웨어를 실행합니다. 이 프로그램은 Windows 7부터 11까지와 Mac OS X 10.12 이상에서 사용할 수 있습니다. 다음을 선택하세요 SIM 카드 잠금 해제 진행하는 모드입니다.

라이트닝 케이블로 iPhone을 컴퓨터에 연결한 뒤 이 컴퓨터를 신뢰하도록 설정하세요. 소프트웨어가 iPhone을 인식하면 다음을 클릭합니다 지금 시작하세요 계속하려면 버튼을 누릅니다.

기기 정보를 확인한 후, 다음을 클릭합니다 우회 시작 버튼을 누르세요. 기기를 탈옥한 뒤 화면 안내에 따라 기기를 설정합니다. 설정을 마치면 확인 를 클릭하여 iPhone의 SIM 잠금 해제를 시작합니다.

Bonus: SIM Failure vs. No SIM vs. Invalid SIM vs. No Service

휴대전화에서 SIM 또는 eSIM 관련 다른 문제가 있을 경우, 아래 표를 확인해 모두 이해할 수 있습니다.

결론

이제 당신은 그 이유를 이해해야 합니다. SIM 오류는 iPhone 13 및 다른 모델에서도 발생합니다. 더 중요한 것은, 이 오류를 제거하고 평소처럼 iPhone을 사용할 수 있는 검증된 해결책을 배울 수 있다는 점입니다. 기기가 이전 통신사에 잠겨 있어 이 오류가 발생한다면, 제한 없이 iPhone에서 SIM 잠금을 빠르게 제거하려면 imyPass 아이패스고 를 시도해 보세요.