- An unlocked cell phone can be used with any carrier and offers more advantages.
- You can check this by trying a different SIM, using codes, or by using the IMEI.
- There are specific methods depending on the brand (Samsung, iPhone, Huawei, LG, Sony, Xiaomi...)
One of the most popular tech gifts is undoubtedly the smartphone . Whether for personal use, to upgrade an old phone, or as a gift, buying a mobile phone often raises a common question: is this phone unlocked or locked to a carrier?
The doubt is logical, especially given the wide variety of channels through which it's possible to purchase a phone these days: from online stores like Amazon, MediaMarkt, or Aliexpress, to second-hand websites, specialized buying and selling forums, and even the phone carriers themselves, which offer them with their plans. Although the vast majority of new phones today are unlocked, there are still reasons to check, especially if you purchased the device through a carrier or on the second-hand market.
In this article you will learn what it means for a mobile phone to be unlocked, how to tell if it is, the most reliable methods to check (including those specific to each major brand) and, if it is not, the easiest and safest ways to unlock it so you can enjoy all the flexibility you need.
What does it mean for a mobile phone to be unlocked?
When we say a mobile phone is unlocked, we're basically talking about a device that can work with any SIM card from any phone company , both national and international, without being subject to limitations imposed by the distributor or operator that sold it. In other words, you can use it with Movistar, Vodafone, Orange, Yoigo, or any other operator, switch companies whenever you want, and, of course, use prepaid or contract SIM cards without restrictions.
On the other hand, a locked or "capped" phone will only work with the SIM of the company it's associated with. This type of lock was common when carriers offered subsidized phones in exchange for a minimum contract. Although this practice has largely fallen out of use, locked phones still occur, especially on the secondhand market or if the phone was purchased through certain promotions.
Advantages and disadvantages of having an unlocked mobile phone
- Freedom to choose rate and operator: You won't be tied to any carrier and can take advantage of offers or promotions from any carrier at any time.
- Works abroad: You can use your phone with SIM cards from other countries without restrictions, ideal for traveling or staying abroad.
- Best resale: An unlocked cell phone can be sold more easily and at a better price, since it does not restrict the future buyer.
- Less pre-installed software: With few exceptions, you avoid carrier apps or customizations.
The only downside is financial: an unlocked phone usually costs more initially because it's not subsidized, but in the long run it makes up for it with the freedom it offers.
How do I know if my phone is unlocked? Universal and brand-specific methods
There are several methods, from the simplest and most universal to more technical or manufacturer-specific ones. Always use the first ones and turn to the others if you need more precise confirmation.
1. Try a SIM from another operator
It's the easiest, fastest, and most universal method. It involves removing the SIM card you normally use from your mobile phone and inserting a SIM card from a different company (ask a family member or friend for one, or use a spare).
- Turn off your phone before changing the SIM.
- Insert the new SIM card and turn on the phone.
- Enter the PIN if requested.
What happens next? If you can make or receive calls, send messages, or access the internet without Wi-Fi, your phone is unlocked. If the device displays messages like 'Invalid SIM', 'Invalid SIM', 'Enter network unlock code', or 'Emergency calls only', the phone is locked to other carriers.
This method is undoubtedly the most reliable way to determine if any mobile phone is unlocked, regardless of the brand or operating system.
2. Taking into account the place of purchase
Another important clue may be the point of sale where you purchased the terminal:
- Official manufacturers' stores (Samsung, Apple, Xiaomi, etc.): All mobile phones sold are unlocked.
- General online stores (Amazon, MediaMarkt, Aliexpress, Phone House, Carrefour, Fnac): they almost always sell unlocked mobile phones, except for specific operator promotions.
- Telephone operators: If you bought it financed or with a plan, the phone may be locked (although this is becoming less common).
- Second-hand and resale stores: Check the condition carefully and ask the seller directly.
Always check the receipt or the phone box, as information about the lock status is usually found there.
3. Check your phone settings
Some phones allow you to check in the settings whether they are locked or unlocked. This method is especially useful on iPhones and some recent Android phones.
- An iPhone: Go to Settings > General > Information. Look for the section called Operator lock o Network provider lockIf you see the phrase "No SIM Restrictions," the phone is unlocked. If you see the name of a carrier or the phrase "SIM Card Locked," it is locked.
- On Android: Go to Settings > Connections > Mobile networks > Network operatorsIf you have the option to manually search and choose between several carriers, your phone is likely unlocked. If only your current carrier appears and you can't change it, it's probably locked.
4. Review the IMEI of the telephone
The IMEI ( International Mobile Equipment Identity ) is your mobile phone's unique identifier. While it doesn't directly tell you if your phone is unlocked, you can check it in some specialized databases (like imei.info ) for details about its locked status. Note: most of the services listed are paid.
- To find out your IMEI, dial *#06# in the call app or check Settings > About phone > Status > IMEI. It also appears on the mobile phone box or label.
- Enter that number on a website like . Look for information related to 'Lock status', 'Network lock', or 'FREE'.
- You can also provide the IMEI to your carrier and ask them directly.
This method is useful if you can't try another SIM, but remember that free websites may not always be up to date, and the most comprehensive ones require payment.
Specific methods to find out if your phone is unlocked according to the brand
Each manufacturer may offer their own secret codes or menu paths to determine if a phone is locked. Here are the most common ones:
Samsung
- Open the calling app and dial * # # 7465625.
- If 'OFF' appears on the screen, your Samsung phone is unlocked. If 'ON' appears, it is locked.
- This method does not work on all new models.
iPhone
- Go to Settings > General > Information and locate 'Carrier Lock'.
- If it says "No SIM Restrictions," your iPhone is unlocked. If a carrier name appears, it's locked.
- Depending on the version, you can also check it in Mobile data > Options and see if 'Cellular Data Network' appears. If it does, the iPhone is usually unlocked.
Huawei
- From the calling app, dial * # * # * # * # 2846579.
- Access the menu Project Menu > Network Settings > SIM Card Lock state query.
- If you see 'SIM Card Lock state NW_LOCKED', your phone is locked; 'SIMLOCK_DEACTIVE' indicates it's unlocked.
Sony
- From the calling app, dial * # * # * # * # 7378423.
- From the pop-up menu, select Service Info > Configuration.
- Look for 'Rooting Status'. If 'YES' appears, the phone is unlocked; if 'NO' appears, it's locked.
LG
- Go to Settings > About phone > Software information.
- If the software version text ends with '-EUR-XX', your LG is unlocked.
Xiaomi
- Xiaomi doesn't have a specific code. Confirmation can be obtained by checking the IMEI on specialized websites or by trying another SIM.
Unlocked and eSIM phones: compatibility and blocking
With the arrival of the eSIM, the idea of an "unlocked" phone becomes even more important. It's not enough to accept traditional SIM cards; it must accept any eSIM from any operator.
- On iPhone: go to Settings> General> Information and check 'Carrier Lock'. If you see 'No SIM Restrictions', accept any eSIM.
- On Android: Go into Settings > Connections > Mobile networks > Network operators and disable 'Select Automatically.' If you can choose other carriers, your phone is also unlocked to use any compatible eSIM.
How to unlock your smartphone if it's not unlocked?
If, after all the checks, you discover that your phone is locked , you can request that it be unlocked. Unlocking your phone is a recognized right, and nowadays the process is much simpler and faster than in the past.
What you need to unlock your phone:
- Having completed the period of stay with the operator if the terminal was purchased under contract.
- Not having outstanding invoices.
- Prove that you are the legitimate owner of the device. To do this, they will ask you for your phone number. IMEI of the mobile.
Contact your carrier's customer service. In most cases, they will provide you with the unlock code and instructions (included in our guide on how to unlock your phone ). This is a free procedure in most countries and with most carriers.
- Insert the new SIM from another operator.
- When your phone asks for the network unlock code, enter the one your carrier gave you.
- The terminal will be free immediately.
For some very old models, you may need to go to an authorized service center or seek professional unlocking services, but these days, almost any phone can be unlocked remotely.
When and why is it important to know if your phone is unlocked?
- Change operator: Before porting your number to another carrier, check if your phone is unlocked.
- Travel abroad: To use local SIMs (traditional or eSIM) and save on roaming.
- Second-hand buying and selling: An unlocked cell phone sells better and is a guarantee for future buyers.
- Take advantage of promotions: Some plans require that your phone be unlocked or accept any SIM/eSIM.
Frequently asked questions about unlocked cell phones
- Does an unlocked phone accept eSIM? Yes, as long as the manufacturer and model are compatible and it is unlocked for any carrier.
- When I unlock a mobile phone, do I lose the warranty? If the release is official and with the operator, you do not lose warrantyIf you use third-party services, please review their terms and conditions.
- Can I unlock a mobile phone purchased abroad? Yes, but the process may require contacting the original carrier or manufacturer. Always check compatibility with your country's networks.
- Are there mobile phones that cannot be unlocked? Almost all of them can be unlocked, except in the case of very old terminals or those from very specific operators.
Checking if your phone is unlocked is a simple yet essential step these days to get the most out of your device, take advantage of any carrier's plans, travel, or give your phone a second life on the secondhand market. Use the methods we've explained, compare them with your smartphone's make and model, and if it's locked, contact your carrier to unlock it safely and for free whenever possible. Enjoy the full technological freedom that's rightfully yours.
