Buying a second-hand phone can save you hundreds of dollars — but it also comes with a hidden risk. If the phone was previously reported stolen, its IMEI may be blacklisted, meaning it cannot connect to any mobile network. You would end up with an expensive brick.
Here is everything you need to know about IMEI blacklists, how they work, and how to protect yourself before buying a used device.
Key fact: A blacklisted phone can still connect to Wi-Fi and run apps — but it cannot make calls, send SMS, or use mobile data on any carrier network.
What is an IMEI blacklist?
An IMEI blacklist is a database of device identifiers (IMEIs) that have been flagged as stolen, lost, or involved in fraud. When a device's IMEI is added to a blacklist, mobile network operators refuse to allow that device to connect to their networks.
The blacklist system is designed to make stolen phones worthless on the legitimate market — if a thief cannot use or sell a stolen phone on a network, it removes the incentive to steal it in the first place.
Who manages IMEI blacklists?
There are several blacklist databases operating at different levels:
- GSMA IMEI Database (GSMA DB): The global database managed by the GSMA. Carriers around the world can check against this database.
- National blacklists: Many countries maintain their own blacklists managed by telecoms regulators. For example, the FCC coordinates blacklists in the USA, Ofcom in the UK, and BTIK in Turkey.
- Carrier blacklists: Individual mobile operators maintain their own lists. AT&T, Verizon, T-Mobile, and EE all run their own blacklist systems that feed into national and global lists.
How does a phone get blacklisted?
A device's IMEI gets added to a blacklist when:
- The owner reports it stolen to their carrier or police
- The device is reported as lost
- The device was purchased with a fraudulent payment method
- The device was reported for insurance fraud
- A carrier contract associated with the device was not paid (in some countries)
Can a blacklisted phone be unblocked?
In some cases, yes. If a phone was mistakenly blacklisted (for example, the owner reported it stolen but then recovered it), the original owner can contact their carrier to have it removed. However, if the device was genuinely stolen and you purchased it unknowingly, getting it unblocked is extremely difficult and not guaranteed.
Warning: Sellers offering to "unblock" a blacklisted phone for a fee are almost always scammers. There is no legitimate service that can unblock a phone that was correctly reported stolen.
How to check if a phone is blacklisted before buying
Before purchasing any second-hand phone, always check the IMEI. Here is how:
- Ask the seller for the IMEI — dial *#06# on the device in front of you, or ask to see it in Settings.
- Check with your carrier — most carriers will tell you if an IMEI is blacklisted on their network if you call customer support.
- Use a paid IMEI checker — services like CheckMEND, IMEI24, or your country's official checker provide blacklist status reports.
- Check our basic validator — our free tool verifies the IMEI is valid and identifies the device model, which is the first step.
Before buying a second-hand phone — checklist
- Ask the seller to show you the IMEI by dialing *#06# on the device
- Verify the IMEI matches the one on the box and under the battery (if removable)
- Run a basic IMEI check to confirm it is valid and matches the claimed model
- Run a blacklist check with a paid service or your carrier
- Ask the seller for proof of purchase (receipt or invoice)
- Meet in a public place and test the device fully before paying
- Be suspicious of prices that seem too good to be true
What to do if you already bought a blacklisted phone
If you discover after buying that a phone is blacklisted, here are your options:
- Contact the seller immediately and request a refund. If they refuse, you may have consumer protection options depending on your country.
- Report it to police — you may have unknowingly purchased stolen property, and reporting it protects you legally.
- Contact your payment provider — if you paid by card or PayPal, you may be able to open a dispute.
- Check if it can be unlocked legitimately — contact the original carrier and explain the situation. In rare cases, if the original owner is found and confirms it is no longer stolen, the block can be lifted.
Start with a free IMEI check
Before anything else, verify the IMEI is valid and matches the claimed device model — it takes 10 seconds.
Check IMEI Free →Summary
IMEI blacklisting is a powerful tool that protects phone owners and makes stolen devices useless on mobile networks. As a buyer, your best protection is to always verify the IMEI before purchase — check it is valid, confirm it matches the device, and run a blacklist check with your carrier or a paid service. A few minutes of due diligence can save you hundreds of dollars and significant frustration.