How-To Guide
How to check if a phone is blacklisted in the UK
A blacklisted phone cannot connect to UK networks and is worth far less than a clean one. Here is how to find your IMEI, check the blacklist status for free, and what to do if something is flagged.
Before you sell a phone, or before you buy one second-hand, it is worth spending two minutes confirming it is not blacklisted. A blacklisted handset cannot register on UK networks, which means it cannot make calls, send texts, or use mobile data. Most reputable buyback services will flag one at inspection and either reject it or pay only scrap value. This guide explains what blacklisting means in the UK, how to find your IMEI, where to check it, and what to do if something comes back wrong.
What "blacklisted" means in the UK
UK networks share a central blocking database. When a phone is reported lost or stolen, or when a finance agreement on the device goes unpaid, the IMEI (a 15-digit hardware identifier unique to every handset) is added to that database. Any UK network that receives a registration request from that IMEI will block it. The phone shows "No service" or "Emergency calls only," regardless of which SIM is inserted.
There are three common reasons a phone ends up on the blacklist:
- Reported stolen. The original owner told their network the handset was taken. The network added the IMEI to the shared database.
- Reported lost. Similar process to a theft report, but the owner may be able to reverse it if the phone is found.
- Outstanding finance. Some networks and retailers block devices if monthly payments stop and the account is not settled. The phone effectively remains the network's property until the balance is cleared.
It is also possible for a phone to be "network locked" without being blacklisted. That is a separate issue. If you want to check lock status, our guide on how to check if a phone is unlocked covers that separately.
Why it matters when selling
If you sell a blacklisted phone without disclosing its status, the buyer will discover the problem the moment they insert a SIM. Depending on the circumstances, selling a phone you know is stolen or subject to a finance agreement can have legal consequences. Beyond that, reputable buyback companies run IMEI checks as part of their inspection process. A device that fails the check will either be returned or paid at parts-only rates.
Checking before you sell protects you. If your phone is clean, you confirm it and proceed with confidence. If it has been wrongly flagged, you have time to sort it out before the sale.
How to find your IMEI
You need the IMEI before you can check anything. There are four ways to find it:
- Dial *#06# on the keypad. The IMEI appears on screen immediately. No SIM is required. This works on virtually every handset.
- Settings on iPhone. Go to Settings, then General, then About. Scroll down to find the IMEI.
- Settings on Android. Go to Settings, then About phone (sometimes under General management). Look for IMEI or Status.
- The original box or SIM tray. Most manufacturers print the IMEI on the retail box. On some iPhone models it is also etched on the SIM tray.
Write it down before you run any checks. You may also want it handy when completing a sale, as buyers often ask for it.
How to check if a phone is blacklisted
Free IMEI checkers
Several websites offer a basic free IMEI lookup. You enter the 15-digit number, and the service returns a status, typically "clean," "blacklisted," or "unknown." Free checks vary in the databases they query. They are a reasonable first step, but they do not always reflect the full UK network blacklist.
Search for "free IMEI check UK" and you will find several options. Use at least one to get an initial read before spending money on a paid report.
CheckMEND
CheckMEND is the recognised paid service in the UK for this purpose. It checks the national database used by UK networks, as well as records from police forces and insurance companies. A standard report costs a few pounds and shows whether the IMEI is blocked, whether it has been reported lost or stolen, and whether it carries outstanding finance.
If you are buying a second-hand phone from a private seller and the value is significant, a CheckMEND report is worth the cost. It gives you documented evidence of the phone's status at the point of purchase, which matters if a dispute arises later.
Asking your network directly
If you are the account holder for the phone, you can call your network and ask them to check the IMEI against their records. They will confirm whether the device is blocked on their network. This is particularly useful if you suspect your own phone has been incorrectly flagged, as the network can investigate and raise a correction with the central database if needed.
What to do if a phone comes back blacklisted
If you own the phone and it is wrongly flagged
Errors do happen. A previous owner may have reported the phone lost and then failed to remove the report when it was recovered. If you have proof of purchase showing you bought the device legitimately, contact the network whose name appears on any block record. Provide your evidence and ask them to investigate. The process takes time but is straightforward if the paperwork is in order.
If you bought a phone and discovered it is blacklisted
If you purchased a phone in good faith and it turns out to be blacklisted, contact the seller first and request a refund. If they refuse or are uncontactable, you have a few options. If you paid by bank transfer or card, speak to your bank about a dispute. If the phone appears to have been reported stolen, report it to the police with any details you have about the seller. Keep all records of the transaction.
What not to do
Do not attempt to have a blacklisted phone "unblocked" through unofficial means. Services that claim to remove IMEI blocks on stolen phones are operating outside the law, and using such a service puts you in a difficult position. The only legitimate routes are through the network that applied the block or, in the case of finance, through settling the outstanding balance with the original lender.
Selling a clean phone with Cash My Tech
Once you have confirmed your phone is clean, selling it is straightforward. Cash My Tech buys iPhones, Samsung, Pixel, and most other Android handsets in any condition, whether pristine or cracked and damaged. The one requirement is that the device is yours to sell: not lost, not stolen, and not tied to an unpaid finance agreement.
You can browse all devices we buy to get an instant quote. Your price is locked for five days, postage is free with a prepaid label, and payment goes to your bank account the same day your phone is inspected before 2pm. Every handset goes through a certified data wipe, compliant with UK GDPR and the WEEE Regulations 2013. We are rated 4.8/5 from over 1,250 reviews.
If you want to understand more about how the process works before you send anything, the how it works page walks through each step.