You can also refer to this video for further details: #3. If it's requesting for a ' SIM Unlock Code' or an ' Activation Code' or you experience error before opening the app, then your iPhone is carrier-locked. If your iPhone request for a passcode, enter your passcode or use the touch sensor to pass. Step 4: Insert the tray back, and switch on your iPhone. Step 3: Diligently pull the SIM tray out once it pops out, and replace the SIM card with another mobile operator's SIM card. You will find the SIM slot by the iPhone casing, and you can open the SIM slot by pushing the SIM eject tool into the small SIM tray Hole. Step 2: Locate and open your SIM card slot using your SIM eject tool or a small paper clip. Step 1: Switch off your iPhone using the power button. Here are the steps to check if your iPhone is unlocked with a SIM card from a different carrier: If a notification with the caption ' SIM Not Supported' or some other request is made from the phone app such as ' Activation Code' or ' SIM Unlock Code' is displayed, then your iPhone is carrier-locked. I presume you know what a carrier SIM Card is? Then, this method is to replace the iPhone's original carrier SIM Card with another mobile operator's SIM Card. Check If Your iPhone is Unlocked Using a Different Carrier's SIM Card If you can find this option, then your iPhone is unlocked, but if not, your iPhone is carrier-locked. Step 3: Find the option labeled ' Cellular Data Network'. This method is one of the oldest methods of checking if an iPhone is unlocked, but it's still very efficient with every version of iOS. Check If Your iPhone is Unlocked via Settings
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The iPhones you pay full price for (typically from the Apple Store ) are unlocked by default.
An unlocked iPhone can be used on any network, while a locked handset is tied to just one.I also asked to make sure I get a 5G sim card. Talked with ST and I get the “new sim card required” spiel. I moved my ST sim card over from my iPhone 7 and it says TFW 5G for about 5 seconds and then no service.
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If you don't check before purchasing a new or pre-owned iPhone, you might end up frustrated and annoying especially when the seller's return policy is not favorable. Check to know if the iPhone you intend to buy is carrier-locked before purchasing.