Why iPhone Says SIM Failure and How to Fix This Problem

Samuel Spenser publicado em outubro 09, 2026Desbloquear iOSLeitura de 3 minutos

“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Outdated software or carrier settings.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.Software glitches.
• 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.

Opção 1:

Entre no Centro de Controle no seu iPhone.

Toque em Modo avião button to turn it off. If it is disabled, turn it on and then disable it.

Opção 2:

Execute o Definições app from the home screen.

Encontre o Modo avião option, and toggle it off.

Solution 2: Re-insert Your SIM Card

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.

Solução 3: reinicie o seu iPhone

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 Lado botão.

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.

Solução 6: Redefinir configurações de rede

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 iPassGo 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.

How to Unlock SIM Card on Your iPhone

Launch the SIM unlocking software once you install it on your computer. It is available on Windows 11 to 7 and Mac OS X 10.12 or above. Choose the Unlock SIM Card modo para prosseguir.

Connect your iPhone to your computer using a Lightning cable and make sure to trust this computer. Once the software detects your iPhone, click the Comece agora botão para continuar.

Check and confirm your device information. Then, click the Comece a ignorar button. After jailbreaking your device, follow the onscreen tutorial to set up your device. When you finish, click OK to begin unlocking the SIM on your iPhone.

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

There are some other problems with SIM or eSIM on a phone, you can check the table below to understand them all.

Conclusão

Agora, você deve entender por que SIM failure occurs on iPhone 13 and other models. More importantly, you can learn the proven solutions to get rid of the error and use your iPhone as usual. If you encounter this error because your device is locked to the previous carrier, try imyPass iPassGo to quickly remove the SIM lock from your iPhone without any restrictions.