What does an unlocked iPhone mean, and should you buy one?

TL; DR

✨An unlocked iPhone isn’t tied to a specific carrier and can be used with almost any network, while a locked iPhone is restricted to one carrier until it’s officially unlocked. Unlocked iPhones offer more flexibility, especially for switching carriers or traveling internationally. You can check if your iPhone is locked in Settings, with a SIM card, or using an IMEI checker. Locked iPhones can only be unlocked through your carrier once eligibility requirements are met. If you want more freedom and fewer restrictions, an unlocked iPhone is often the better choice.

Why can you trust this guide?

At Back Market, we specialize in helping people buy high-quality refurbished tech with confidence. Our team researches device specifications, carrier policies, and industry best practices to ensure the information we provide is accurate and up to date. For this guide, we have reviewed current iPhone carrier lock and unlock requirements, Apple device settings, and common buying considerations to help you understand what an unlocked iPhone is and if you should get one. Whether you’re considering an unlocked iPhone for greater flexibility or comparing it with a carrier-locked device, our goal is to provide you with clear, practical advice to guide your buying decision.

Which should you choose: a locked or an unlocked iPhone?

💡Tip: If flexibility matters, unlocked iPhones are usually the better long-term choice.

What is the difference between an unlocked and a locked iPhone?

✨A locked iPhone is restricted to a single carrier, while an unlocked iPhone isn’t tied to any one carrier and offers greater flexibility to switch carriers.

The key difference is simple: a locked iPhone is tied to a specific carrier, while an unlocked iPhone is not. A locked iPhone is restricted to one network (AT&T, Verizon, or T-Mobile, for example) because it is configured with software that prevents it from working with other carriers. These phones are usually available at a discount via carrier deals or installment plans, but they come with restrictions that limit flexibility.

On the other hand, unlocked iPhones are not tied to any carrier. They can work with most networks worldwide, as long as the device is compatible with the carrier’s bands. This makes it easier to switch providers, use dual SIM or eSIM setups, or add a local SIM when traveling internationally. Additionally, you can get prepaid plans for unlocked iPhones.

You may also see the term “SIM-free” or “factory unlocked”, which is slightly different. A SIM-free or factory unlocked iPhone is one sold without a SIM card and has never been locked to any carrier from the start. These are phones purchased directly from Apple. However, an unlocked iPhone may have originally been locked to a carrier and later unlocked after contract completion. While both function similarly today, SIM-free devices are considered the “cleanest” option because they were never restricted in the first place.

At Back Market, we make the choice simple by clearly showing whether each iPhone on our pages is unlocked or locked. If a device is locked, we also specify the carrier it works with. When we say an iPhone is unlocked, we mean it is SIM-free, giving you the flexibility to use it with all major carriers. Each product page is fully transparent, so you always know exactly what you’re getting and can shop with confidence.

How do I check if my iPhone is locked to a network?

✨You can check if your iPhone is locked or unlocked through Settings, a SIM card test, or your IMEI number.

You can check whether your iPhone is locked or unlocked in three main ways: using your iPhone Settings app, testing it with a SIM card, or checking its status using your IMEI number. It’s not possible to tell just by looking at the device whether an iPhone is locked or unlocked, since Apple doesn’t allow carriers to brand iPhones (so you won’t see a T-Mobile, Verizon, or AT&T label on the phone itself). However, it’s still easy to find out its status using these methods.

How to check if an iPhone is unlocked using Settings

The simplest way to check whether your iPhone is locked or unlocked is to use the Settings app on your phone. Follow these steps to see if your iPhone is locked to a carrier:

1. Open the Settings app.

2. Tap on General.

3. Select About.

4. Swipe down to Carrier Lock. If the device is locked, it will display the name of the specific carrier or say “SIM locked.” If the device is unlocked, it will say “No SIM restrictions.”

How to check if an iPhone is unlocked using a SIM card

If your iPhone has a physical SIM tray, one of the quickest ways to check whether it’s unlocked is to try inserting a SIM card from a different carrier. If the phone accepts the new SIM and connects to the network, it’s unlocked. If it rejects the SIM, it’s likely locked to another carrier. Follow these steps to test this:

1. Power off your iPhone.

2. Use a SIM eject tool to remove the current SIM card.

3. Insert a SIM card from a different carrier.

4. Turn the phone back on and wait for it to connect.

If the iPhone connects to the new network and you can make calls or use mobile data, the device is unlocked. If you see a message saying the SIM card is not supported or that only SIM cards from a specific carrier can be used, the iPhone is locked.

Please note that this method only works on iPhones with a physical SIM tray (US iPhones predating the iPhone 14). Since the iPhone 14, Apple has sold US models without a SIM tray, relying entirely on eSIMtechnology. If you have one of the newer devices (iPhone 14, iPhone 15, iPhone 16, or iPhone 17 models bought in the US), use the Settings or IMEI methods instead.

Note: The iPhone SE (3rd gen) is an exception, as it supports both a physical SIM and an eSIM, so you can use the SIM card method to check whether it's unlocked.

How to check if an iPhone is unlocked using an online IMEI checker

Every iPhone has a unique 15-digit IMEI (International Mobile Equipment Identity) number that carriers use to identify the device and track its lock status. This method works for both physical SIM and eSIMiPhones, making it a useful option if you can’t test the phone with another SIM card.

To find your IMEI number:

1. Open the Settings app.

2. Tap on General.

3. Select About.

4. Scroll down until you see IMEI.

5. Copy or write down the 15-digit number.

Once you have your IMEI, enter it into an online IMEI checker to see whether the iPhone is locked or unlocked. These tools can often provide additional information about the device, such as its original carrier and activation status. Keep in mind that many IMEI checkers charge a small fee to access this information.

How to check if an iPhone is locked by contacting your carrier

If you’re still unsure whether your iPhone is locked or unlocked, contact your carrier directly. While it may take longer than checking your phone’s settings or using an IMEI checker, your carrier can confirm your device’s lock status using its IMEI number. This is a helpful option if you’ve recently purchased the iPhone, don’t have another SIM card to test with, or want to verify whether your device is eligible for unlocking.

How do I unlock my iPhone?

✨A locked iPhone can only be unlocked by its carrier, usually after the device is fully paid off and contract obligations are met. If you’re wondering how to unlock your iPhone, the process is fairly straightforward. If your iPhone is locked to a carrier, the only way to unlock it is through that carrier. In most cases, your device must be fully paid off, and any contractual obligations must be completed before the carrier will approve an unlock request. Once you’re eligible, contact your carrier or submit an unlock request through their website. After they confirm that your iPhone has been unlocked, it’s a good idea to back up your device before completing the final steps. The process for activating an unlocked iPhone depends on whether you use an eSIM or a physical SIM card:

• If you use an eSIM: Activate a new eSIM from your chosen carrier by following their setup instructions.

• If you use a physical SIM card: Power off your iPhone, remove the old SIM card, and insert the SIM card from your new carrier.

Need a step-by-step walkthrough? Follow our guide to activate your new iPhone with eSIM or SIM card and get connected from day one.

What are AT&T, T-Mobile, and Verizon’s iPhone unlock requirements?

✨ If you’re using a carrier-locked iPhone, each network has specific requirements you must meet before the device can be unlocked. While the exact rules vary by carrier, they generally focus on three things: device age, payment status, and account standing.

AT&T unlock requirements

To unlock an iPhone on AT&T, the device must meet all of the following conditions:

• The device must have been purchased more than 60 days ago.

• The device must be fully paid off (or paid in full through an installment plan with zero balance).

• The device must not be reported lost, stolen, or involved in fraud.

• The account associated with the device must be current and not past due.

• The device cannot be active on another AT&T account.

Once these conditions are met, AT&T can process an unlock request free of charge, allowing the iPhone to be used on other compatible networks.

T-Mobile unlock requirements

T-Mobile also requires devices to meet eligibility criteria before they can be unlocked. These include:

• The device must have been originally sold by T-Mobile.

• The device must not be reported lost, stolen, or blocked.

• The account associated with the device must be in good standing.

• The device must meet postpaid or prepaid requirements.

For postpaid devices:

• The device must have been active on the T-Mobile network for at least 40 days on the requesting line.

• If financed or leased, the device must be fully paid off.

• If the account is canceled, the balance must be zero.

For prepaid devices:

• At least 365 days of active service must have passed, OR

• If activated less than 365 days ago, the prepaid account must have had more than $100.00 in refills per active line, and more than 14 days must have passed since the device was purchased.

• No more than two unlocks per line per 12 months are allowed.

T-Mobile may also request proof of purchase or additional verification before approving an unlock.

Verizon unlock requirements

Verizon’s unlocking policy is more straightforward.

• The device must be fully paid off (or paid in full through a device payment agreement with zero balance).

• The device must not be reported lost, stolen, or flagged for fraudulent activity. Devices reported lost or stolen won’t be unlocked until cleared from the lost or stolen report.

• The account associated with the device must be in good standing with no past-due balances.

• For prepaid devices, the phone must have completed 365 days of paid, active service on the Verizon network.

• For postpaid devices, if a Verizon Gift Card or non-secure payment was used to pay off the balance, a 35-day verification period must pass before unlocking.

How do the carrier unlock requirements compare?

Why should you buy a refurbished iPhone from Back Market?

“The most beautiful iPhone ever, I’m so in love!! perfect, just like brand new. :) I would highly recommend Back Market, it went so smoothly & much easier and cheaper than going through a carrier. Thank you!!” - Hannah S. Reviewed 2/9/26.

When you buy a https://www.backmarket.com/en-us/l/iphone/e8724fea-197e-4815-85ce-21b8068020cc from Back Market, you get a high-quality device at a significant discount all year round. Devices available on Back Market typically cost 20-50% less than the price of a new one. These phones aren’t “second-best” devices; they’re professionally refurbished by industry experts to ensure they meet strict quality standards and perform up to their original benchmarks.

Each device goes through a thorough refurbishment process that includes a detailed inspection, testing of key components, replacement of any faulty parts, cleaning, and final quality checks before being listed for sale. This is the Back Market Promise that ensures you receive a reliable iPhone that’s ready for everyday use. Additionally, every purchase comes with a 1-year warranty for peace of mind and a 30 days return window to change your mind.

Beyond the savings, choosing refurbished is also a more sustainable option. It helps reduce electronic waste and lowers the carbon emissions associated with manufacturing new devices. By extending the life of existing technology, refurbished iPhones offer a smarter choice for both your wallet and the planet.

Can you trade in your old iPhone for cash?

Got an old smartphone, tablet, or laptop lying around? With Back Market, you can trade in your used tech and get cash back, making it easier to upgrade to your next device. It’s a simple way to give your old electronics a second life, reduce e-waste, and save money on your next purchase. Just check your device’s value after a quick online evaluation, send it to us for free, and get paid once it’s assessed. It’s that simple.

How much do locked vs. unlocked iPhones cost from Back Market?

At Back Market, you can choose between unlocked and locked refurbished iPhones based on your budget and flexibility needs. While retailers and carriers typically sell iPhones, both locked and unlocked, at full price, Back Market offers high-quality refurbished devices at significantly lower prices. See how prices on Back Market for unlocked and locked iPhones compare with retail prices and see how much you can save while choosing the best iPhone for your budget.

*Back Market prices taken at the date of publication – these are subject to change. New prices reflect Apple's manufacturer's suggested retail price at date of launch.

Is an unlocked iPhone the right choice?

Understanding whether an iPhone is locked or unlocked can make a big difference in how much freedom you have with your device. While locked iPhones are tied to a specific carrier, unlocked iPhones give you the flexibility to switch networks, use local SIMs when traveling, and take control of your mobile plan without restrictions.

If you’re ready to skip carrier limitations and avoid unlocking requirements altogether, an unlocked iPhone is usually the smarter long-term choice. At Back Market, you can easily find high-quality, unlocked refurbished iPhones at a fraction of the price of new devices, helping you save money without compromising performance. Explore our page of unlocked iPhones to find the best iPhone for your budget.Explore the best place to buy an unlocked iPhone and find the right model for your budget.