Step 1: Install the latest version of iTunes on the computer. Step 2: Use a USB cable to connect the iPhone to the computer. If you get a message that says SIM card not installed, it implies the device is locked to the carrier. Step 3: If it's locked, please click the iPhone icon on iTunes, and go to Summary > Restore.
Here’s how you can do it: Login to your T-Mobile online account. Navigate to the “Manage Account” or “My Account” section. Look for the option to unlock your SIM card PUK. It may be under the “Support” or “Services” tab. Click on the option to unlock your SIM card PUK. You may need to provide some information, such as your 2 Open Settings, and click/tap on the Network & Internet icon. 3 Click/tap on Cellular on the left side, and click/tap on the Advanced options link on the right side. (see screenshot below) If you more than one SIM or eSIM, select the SIM you need to unblock in the Use this SIM for cellular data drop menu before you click/tap on the AdvancedAsk your carrier to help you unlock your SIM card or eSIM using the default SIM PIN or PUK code. If you can't unlock your SIM card or eSIM using the SIM PIN or PUK code or if an alert says, "PUK exhausted," ask for a new SIM card or eSIM. * If you enter the wrong SIM PIN too many times, your wireless carrier might be able to give you a Personal
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